YOUNG ADULTHOOD DEVELOPMENT (20-40 YEARS).

INTRODUCTION Human development is saddled with the responsibility of taking a look (also critical) at the scientific data, postulations and observations regarding the physical, cognitive, social and emotional behavior of the human organism at various stages of development. The issue of developmentalism is emphasized in the types of behavioral changes that occur with age. In the yesteryears, focus was mainly channeled on child development excluding other stages of the human life span but with findings and the development of theories in Developmental Psychology, development from the fetus in the uteral environment through childhood (early and late) to adolescence, through the adult years (young, middle and later) and the aging years entered into the research interest and ambience in human developmental psychology. Studies were able to bring out the continuation and changes in development from ‘womb to tomb’. Cf. Ajibola O. Falaye, Human Life Span Development: A Basic Text in Developmental Psychology (Ibadan: Stirling-Horden Publishers (Nig.) Ltd., 2001), p.1-3 Why am I the way I am? Why the different outcomes? These questions of how we become who we are not recent ones at all: it has obsessed and perplexed the human mind since the invention and application of reason (if at all reason was invented). History has been perennially characterized by attempts to understand what makes us human, what shapes our thoughts and behavior. Religion earlier played a role in attempting to unknot human behavior through the Christian assertion of ‘original sin’, the idea that man is born flawed and susceptible to undesirable behavior. Philosophers added to the debate as the centuries unfolded. John Locke, for instance, suggested that man was born a ‘blank slate’ or ‘tabula rasa’ and that life experiences shape who we become. Jean-Jacques Rousseau, in contrast to the Christian view, believed in the innate goodness of man striving to reach his full potential. Of course these arguments are best left to theologians and philosophers but the study of psychology is really not much different from these, put simply, it attempts to gain understanding of humans, their development and behaviors. However, as we will succinctly look at in subsequent sub-topics, Eriksons’s theory unlike that of Sigmund Freud postulates that development does not end at adolescence but continues throughout a person’s lifetime. But for the purpose of this paper, we will extensively direct our tentacles majorly to the developmental stage of young adulthood (20-40 years), its domains of development and challenges. In going about this it will be apposite to deal methodologically with some conceptual clarifications; the domains of human development after which we will then delve into the general concepts and principles of human development; adulthood development; the challenges in young adulthood and as a means of recapitulation we shall conclude. CONCEPTUAL CLARIFICATION The diverse meanings of diverse concepts necessitated this sub-topic. For the purpose of this paper we shall clarify two concepts: Developmental Psychology and Young Adulthood within the developmental ladder. The concept of development refers to the systematic and sequential continuities and changes that occur in an individual throughout the life span of man (from conception to death). It refers to qualitative changes in an organism. It is a progressive series of orderly and coherent changes in human beings. Consequently, developmental psychology is the largest in the multidisciplinary fields in the science of development as many biologists, sociologists, educators, anthropologists and physicians all have interest in the continuities and changes that take place in the development of both humans and animals. However, developmental psychology as a component of psychology is a scientific approach which aims at explaining how children and adults change over time. Cf. Margaret Harris and George Butterworth, Developmental Psychology: A Student’s Handbook (USA: Psychology Press Ltd., 2002), p. 16. It is concerned with the changes in human behaviors throughout their life span. This component is closely linked historically to the evolutionary theory, as it concerns issues related to ontogeny (that is, the development of the individual) and phylogeny (that is, the development of the species). While ontogeny is an individual’s specific changes, phylogeny is concerned with changes observed in the specie of humans. Cf. Hayne W. Reese (ed.), Advances in Child Development and Behavior Volume 9(London: Academic Press Inc. Ltd., 1974), p.54. The three goals of developmental psychology are to describe, explain, and to optimize development. Psychologically, a young adult is generally a person in the age range of 20 to 39 (or 40). The young adult stage in human development precedes middle adulthood. A person in the middle adulthood stage ages from 40 (or 41) to 64. In old age, a person is 65 years old or older. DOMAINS OF HUMAN DEVELOPMENT Human Development is not one that can be easily grasped as Man is the most complex being in the natural world. Cf. A.G. Karczmar and J.C. Eccles, Brain and Human Behavior (New York: Springer-Verlag, 1972), p.420-426. This has spurred the rigorous studies undertaken by psychologists to shed a clearer understanding on man by categorizing the development of man under 4 domains (physical, social, psychological and mental). It is worthy of note that these domains do not develop in isolation. In other words, as one grows physically, so he grows socially, psychologically and cognitively. Thus, there is a ‘co-filial’ and ‘uni-filial’ and development of the four domains in man. The task of shedding light on these four domains of human development will be the specific project of this sub-topic: Physical Development This is a domain of human development which encapsulates changes that occur in the physical body and brain. These include height, weight, muscular and skeletal changes. Also included are sensation and perception. Sensation refers to the functions of the sense organs (vision, hearing, taste, touch and smell), and refers to the awareness of conditions or feelings inside and outside the body. Perception is how we process the information taken in by our senses. Finally, physical motor development and skills are also included. Put simply, ‘motor’ is another term for movement, so motor development refers to the development of movement and skills such as grasping, walking and manipulating objects. It also includes the effects of aging, resulting in cognitive changes, such as in the use of eyes, muscular strength, and ability and so on. Cf. https://www.gillmacmillan.ie/AcuCustom/Sitename/DAM/058/Human_Growth_and_Development_-_Look_Inside_Sample.pdf. Cognitive or Mental Development This sphere of human developmental process is concerned with the changes and development in reasoning and thinking, language acquisition and the way individuals gain and store knowledge from their environment. It includes learning which is relatively a permanent change in behaviour, thinking and feeling. Psychosocial Development This is a conglomerate of the psychological and social developmental domains of human development. Man is a social creature Cf. Kenneth J. Gergen and Mary M. Gergen (ed.), Historical Social Psychology (USA: Psychology Press, 2013), pp. 330-335.and because of the veracity of this fact, relationships with others are essential for human development. Their impact, can be both positive and negative but they are always defining. Our emotional development is related to our social relationships, also encompassing our temperament and personality. Meggitt (2006) suggests the following definitions: Emotional Development Emotional development involves the development of feelings: • The growth of feelings about, and awareness of, oneself • The development of feelings towards other people • The development of self-esteem and a self-concept. Social development includes the growth of the individual’s relationships with other people. Socialisation is the process of learning the skills and attitudes that enable the child or adult to live easily with other members of the community. Cf. Carolyn Meggitt, Child Development: An Illustrated Guide (London: Heinemann Educational Publishers, 2006), pp. 1-3. It entails relationships with significant others such as family, peers and teachers, as well as the evolving of an individual’s identity and sense of self. Cf. Cf. Ajibola O. Falaye, Human Life Span Development: A Basic Text in Developmental Psychology (Ibadan: Stirling-Horden Publishers (Nig.) Ltd., 2001), p.1-3 GENERAL CONCEPTS AND PRINCIPLES OF HUMAN DEVELOPMENT Arising from the numerous evidences of orderly and predictable patterns in the process of human development, some inevitable concepts and principles of laws of development have evolved. These basic concepts within the milieu of developmental psychology are: Growth: This pertains majorly to physical development which comprises: The stability of the skeleton Increase in height and weight Change in size and functional capacity of internal organs oh human beings. Growth refers to quantitative changes in an organism. This usually involves permanent increase in size and structure of organisms. These quantitative changes are both physical and mental. These include physical changes in height, weight, girth, internal organs and mental changes in memory, reasoning, perception and creative imagination. All these changes make the child to be physically grown and mentally responsive. The quantitative changes in height, weight, girth etc. are as a result of multiple cell divisions called MITOSIS (Mitotic Cell Division). This usually involves body cells called Somatic Cells (Vegetative cells). Somatic cells always have 23 pairs of Chromosome (i.e. 46) called the Diploid number (2n). In the process of Mitosis, one cell divides into two, then into four, eight etc. Each daughter cell is always similar in every way to the parent cell and they always have the Diploid number (2n) of Chromosomes. Growth is a sine qua non as it necessitates the appropriate change in behaviour that characterises the different age stages of human development. Maturation: Maturation is the process of gradual unfolding of the inborn and innate potentialities of traits present in the individual because of hereditary endowment. According to Gessel, “Maturation is the net sum of the effects operating in a self-limited life-cycle”. This definition connotes individual differences. Cf. Cf. Ajibola O. Falaye, Human Life Span Development: A Basic Text in Developmental Psychology (Ibadan: Stirling-Horden Publishers (Nig.) Ltd., 2001), pp.4-5.Maturation goes along with physical growth and the development of the central nervous system. Time and experience are also inevitable. Maturation is a function of two major factors, which are in turn dependent on time and experience viz: Phylogenetic Functions These are functions, which are common to all members of a species. These include crawling, creeping, sitting, walking, etc. Experience is not necessary to these functions as they are time, age and physical and mental maturity dependent. Ontogenetic Functions These depend on experience. They are functions common to individuals. Some of these functions are swimming, climbing, painting, speech, etc. Here, without experience or training, development cannot take place. It should be noted that no hereditary tendency can mature fully without environmental support. In other words, environment influences development. Cf. http://www.nti-nigeria.org/nti-pgde/PGDE-4.pdf. Learning: This is essentially the relatively permanent modifications in behaviour. Cf. Robert Aunger and Valerie Curtis, Gaining Control: How Human Behavior Evolved (London: Oxford University Press, 2015), p.14. This is a change in performance that results from experience, special training, observation and/or exercise. Growth, maturation and learning are factors which are interdependent in the process of development. Cf. Rocio Reyes Kapunan, Educational Psychology (Philippines: REX Book Store, 1974), p.14. All developmental phenomena reflect the results of complex interactions between the individual’s unique genetic make-up and the unique and delimited environmental stimuli a person is exposed to. Critical Periods: This concept hypothesises that normal proceeds through a number of stages or phases, with some stages being marked by increased receptivity to environmental conditions. This receptivity, some psychologists termed the ‘readiness’ for certain experiences in development. What happens at each stage has profound and far-reaching effects on subsequent stages of development and learning potentialities. There are critical periods occurring not only in the physical, motor or sensory perceptual aspects of human development, but also in the development of behavioural systems and processes, such as socialization. Hence, the psychoanalytic postulation of the first five years as a critical period in the personality development of the child, can also indicate the conflicts and stresses associated with adolescent development. Sequentiality of Development: This concept is basic to the process of human development. It assumes that development is continuous and proceeds in an orderly, predictable and sequential pattern that is general to all human beings. This however does not overlook the variability in rate of such development. GENERAL PRINCIPLES OF DEVELOPMENT Every species follows a pattern of development peculiar to that species. However, there are general principles that govern the understanding of human development. These principles do not work independently, but rather holistically, in which case there is the holistic overview of all these principles, presenting a total picture of the developmental process. These principles include: Cephalocaudal Growth Patterns: According to this principle, development spread over the body from head to foot. This means that improvement in structures and functions come first in the head area, then in the trunk and leg region. The organs in the area of the head develop first and mature first before the organs in other areas. The head develops and achieves its final forms before the trunk and the legs. The child is first able to see, hear sound and jingles before using his hands and legs in a meaningful way. Proxismodistal Growth Pattern: This principle holds that development proceeds from the central axis of the body towards the extremities. In the Foetus, the head and the trunk are well developed before the rudimentary limb buds appear. The arm buds gradually appear and develop into the hands and lastly fingers before his hands and fingers respectively and can use the latter as a unit before he/she can control the movements of his/her fingers. Structure therefore precedes function. The Principle Of Differentiation: Development proceeds from simple to complex, from homogenous to heterogeneous and from general to specific (from general and diffuse responses to more differentiated and specific ones). Thus, coordination of large muscle groups precedes fine muscle movements. At conception, the mother egg-cell and the sperm from the father fuse to form the Zygote. The Zygote itself contains 23 pairs of chromosomes. It starts to divide itself into 2 then 4 to 8 up to billions of cells that form a body, be it circulatory, muscular, nervous or skeletal. In both mental and motor responses, general activities always precede specific activities. In any postnatal life, the infant can move its whole body but incapable of specific responses. The baby can wave his arms, in general movement before he/she is capable of any specific reaching. In speech, the baby learns the general words before specific words e.g. he/she learns to use the word toy before learning to call each toy by its name. He/she calls every man “Daddy”. In writing the child learns to hold a big object before a pencil. He/she learns to make a circle before triangle. The Principle of Asynchronous Growth Or Split Growth The principle holds that the changes that occur in the body proportion are due to Asynchronous or Split Growth. This means that the different parts of the body have their own period of rapid and slow growth; and that each reaches its own mature size at its own time. Growth in all parts of the body is however continuous and concurrent e.g. a child’s brain does not stop growing while his/her muscles are growing (Growth is continuous and not salutatory though there is asynchronies). Asynchronous growth is particularly obvious when different parts of the body are compared e.g. the muscles, bones, lungs and the genitals increase approximately 20 times during the growth years, while the eyes and the brain which are relatively more developed at birth increase much less. The eye balls complete their growth during the first 5 years and the brain also completes its growth during the first 10 years but the heart and some other internal organs requires more than 20 years to complete their growth. Organs-systems and function do not proceed at the same rate throughout development. Though growth and development usually proceed in an orderly sequence, the rate of growth often differs from one organ and system to the other and from one period to another. During childhood, the development of the genitals is slow but very fast during adolescence. Principles Of Discontinuity Of Growth: This principle posits that the rate of growth changes at different periods. There are periods of acceleration and decelerations of growth. During the first 9 months in the womb the growth is very fast. The child develops from a microscopically small sperm cell to an infant of about 3kg mass. The growth is mainly physiological and consists of all bodily structures. For the first 14 days (during infancy) the growth is temporarily at a standstill. It is a period when the new-born baby tries to adjust itself to a completely new environment outside the mother’s womb. From babyhood until about 2-3 years of middle childhood up till the time of puberty, growth is slow. Puberty changes are as a result of environment and individual differences. There is a period of growth spur before adolescence. From puberty till the age of 15 or 16 years, growth is fast. This period is followed by gradual stability up to the time of maturity. In brief, there are four stages of growth comprising 2 rapid and 2 slow stages viz: a) From birth – 2 years - Rapid growth. b) From 2 years to Puberty - Slow growth. c) Puberty – 16 years - Rapid growth. d) 16 – Maturity - Growth is slow. Principle Of Complexity Of Growth: Growth is an extremely complex process. It has different collective aspects. It is complex because what happens to one area affects other areas. The effect of this is that it is not easy to specify causal relationships since there can be other causes in other areas i.e. causes for growth retardation in a child may be traced to reasons other than malnutrition. Structure Generally Precedes Function: It may be because of emotional stress, illness, social isolation or physical harm. All physical components of the body including the brain usually mature and get ready before they can be functional. Before any organ can be used by the child, such an organ must be physically and physiologically ready before they can perform developmental tasks. Principle Of Uniqueness Of Individuals: The principle asserts that every individual is unique; that there are no two people that are exactly alike. Every child’s pattern and rate of growth is peculiar to him or her. We may say that an average age for a child to walk is 12 months, yet some children walk later or earlier than this. Average is therefore theoretical however useful it may be. Among twins of the same background, there are still some obvious differences. One may be more active than the other. Uniqueness occurs in either specific, general, sensitivity or vigour. By sensitivity we mean over-all reaction to stimuli. This is why homozygotic twins of the same background could be different. Some children like being quiet, others respond to stimuli gradually and yet others respond very fast. This gives rise to individuality in the classroom. Some children are more active and very vocal while others are quiet and calm. Modifiability Of Rates And Patterns Of Growth: The view of this principle is that growth is natural but the rate and pattern of growth can be modified by various factors and techniques. Some of these factors are: 1. Nutrition and Drug taken by the mother. 2. Environmental Stimulation. 3. Opportunity to Learn. 4. Illness and Disease. 5. Genetic aspect (Mutational changes). The presence or absence of some of these factors can retard the rate and pattern of growth. ADULTHOOD DEVELOPMENT: The stage of adulthood is the last and longest phase of human development. Cf. Lionel Nicholas (ed.), Introduction to Psychology (Cape Town, UCT Press, 2008), p.248. Although there is no clear or distinct point when adulthood begins it is universally agreed that adolescence gradually fades into young adulthood and at a later point, full adulthood begins. Though the study of adulthood had not being considered as serious but the changing emphasis on learning like education for all, life-long learning, distance education, adult education etc. and the fact that we spend the greater part of our lives as adults (during which we are faced with the challenges of adult love, work, play, marriage, parenting, etc.) makes it mandatory for us to study adulthood (mainly young adulthood) within the developmental ladder. The study of adulthood involves the study of the developmental sequences and characteristics of the individual and his capacity for learning. WHO IS AN ADULT? The definition of who an adult is per se has a feature of cultural variance. Cf. Theodore Millon et al (ed.), Oxford Textbook of Psychopathology (New York: Oxford University Press, 1999), p.254. Adulthood can be explained from biological, psychological, chronological age, social responsibility and perceived maturity perspectives. An adult may be seen as an individual who has attained the age of maturity with full capacity to produce off-springs. Biologically, adulthood commences from the onset of puberty when the individual can produce off-springs. This may be accompanied by changes in skin texture, hair, body size and sight. Cf. Richard M. Lerner et al (ed.), Handbook of Child Psychology and Developmental Science (New Jersey: John Wiley & Sons Inc., 2015). p.213. Psychologically, adulthood is defined by maturity and the way the individual perceives himself/herself. This will include the chronological age, level of confidence in certain tasks, emotional stability and social responsibilities. Cf. Alvin Lewis, Strategies for Educating African American Adults (Chicago: Urban Ministries Inc., 2006), p.56. Chronologically, adulthood is defined by the number of years the person has lived on earth. This is the most controversial because there is no consistency in age for determining adulthood. While some claim 18 years, others suggest 20 or 21 years yet in some African countries anybody below age 25 years may not be considered as adult. Legal, political and economic adulthood in Nigeria begins at age of 18 years. Socially, adulthood is defined by the level of social responsibilities the person assumes. This may be inherited, acquired or externally imposed. However, exceptional situations where young children take on the responsibilities of their parents or other adults owing to accidents, deaths etc. cannot be used to determine adulthood. An adult should therefore to able to assume the roles of husband or wife, father or mother, full-time worker etc. in the society. MATURATION AND AGING Maturation refers to progress towards maturity or adulthood. It is the process of gradually bringing the various physiological and psychological features to full development in readiness for adult social participation. In order for the individual to survive, the biological features of human beings mature first and start functioning adequately. These are followed by psychological capabilities such as attitude, interest, personality, and self-concept. The last sets of features are the social features of an individual which make him to cope with others and the society. Maturation thus comes with age. Cf. Robert M. Malina et al, Growth, Maturation and Physical Activity (USA: Human Kinetics, 2004), p.277. Growing old is considered as aging. Aging is a continuous process that begins at conception through birth, infancy, childhood, adolescence, adulthood and ends with death. Timiras opines that aging is also described as a decline in physiological competence which inevitably increases the incidence and intensifies the effects of accidents, disease and other forms of environmental stress. Cf. Joseph Lassner et al (ed.), Social Group Work: Competence and Values in Practise (New York: Routledge, 2013), p.168. A number of approaches had been used to explain the process of aging. Some of the theories used to explain aging include: (a) The physiological theory of aging which states that the human organism undergoes wear and tear as it advances in age. Thus, as a man grows, he simply wears out and the structures and organs of his body decline both in function and appearance. (b) The homeostatic imbalance theory holds that aging is characteristically an increase in homeostatic faults i.e. PH and sugar levels. Some diseases are associated with this. (c) The hereditary theory which states that people with grand-parents who live long also tend to live even longer than their grand-parents. (d) The environmental factor theory states that aging may be due to external factors such as diseases, viruses, rural living and radiation. The theory asserts that there are some factors operating in the environment which initiate and sustain the process of aging. Ten stages of human development have been identified by the psychologists –Pre-natal, Neonatal, early-infancy, late-infancy, childhood, middle childhood, late childhood, adolescence, adulthood and senescence. From Pre-natal stage to adulthood, all the systems of the body are progressively growing and man is active. However, from adulthood stage to senescence, all the systems in the body begin to decline both in function and structure. This is characterised by weight lost, decline in intelligence, level of hearing and sight, wearing off of teeth, inability to walk without stick etc. PHYSICAL DEVELOPMENT AND CHALLENGES FACED BY THE YOUNG ADULT. Naturally, growth ceases at 18 and human beings mature physically between the age of 25-30 years when the body reaches its maximum size and strength. From this period, wearing down of the tissues commences. The living processes then starts slowing down and aging sets in. Physical, speed and endurance also decline. VISUAL ACUITY Though a number of other factors may account for visual impairment at adulthood (refractive errors, accident, muscle, impairment, diseases, cataract, glaucoma etc.) aging is the most critical factor. More and more of adults need reading glasses for near vision with increasing age and have difficulty seeing in weak light and in the periphery of vision due to loss of red cells in the retina during the young adulthood stage. HEARING ACUITY Most times the ability to hear high-pitched tones declines after 20 years, with loss of ability to hear low-pitched sounds. Rapid decline in hearing often starts at the age of 20 when the Central Nervous System begins to decline in function. SENSE OF TASTE The sense of taste remains much intact into late life though many adults often report that food tastes blander. This is because the sense of smell declines with aging. REACTION TIME Reaction time measures the time interval between receiving a stimulus and reacting to it. Reaction time increases from early childhood, reaches its maximum at about 20 and then significantly declines beyond 40s. OTHER PHYSIOLOGICAL CHANGES A substantial number of older adults (both young adults inclusive) show marked declines due to cerebral arteriosclerosis (hardening of the arteries) which results in serious loss of intellectual ability. The rate and extent of these declines differ markedly from individual to individual depending partly on the level of healthy exercise and activity that the individual maintains during adulthood. Between 40 and 55, there is a decline in the strength and speed of movement in the heart. Oxygen supply to the brain also diminishes with increasing age. All these will affect the capacity of an adult to learn. COGNITIVE DEVELOPMENT OF A YOUNG ADULT Cognitive development continues to take place during adulthood. Small but steady improvement occurs from 20s down to 70s in the components of crystallized intelligence such as knowledge of facts and word meanings. No declines occur before about age 75 in such fundamental aspects of intelligence as the ability to reason about everyday problems, and understand mathematical concepts, or to learn and remember meaningful information. However, declines do occur in fluid intelligence and short term memory during later adulthood. Older adults tend to perform slightly less well than younger adults in abstract problem solving, divergent thinking and cognitive tasks that must be performed quickly. The cognitive performance younger adults is generally higher than that of older adults, however, within the sphere of adulthood the younger adults do better on tasks of word meaning and decision making and perform equally on learning and reasoning about every day concepts. EMOTIONAL DEVELOPMENT AND ITS CHALLENGING FEATURES TO THE YOUNG ADULT: Erikson postulates that development does not end at adolescence but continues throughout a person’s lifetime unlike the psychosexual stages of Sigmund Freud. It is Erikson’s belief that there are eight major crisis period that the individual faces in the process of development and that these crises develop at a distinct period of age, based on the conflicts of biological maturation and pressures of social demands. The successful resolution of the crisis at a particular stage prepares the individual for the next stage. Erikson further proposed the stages of adulthood development which are clearly different from those of the childhood in that (a) Not every adult goes through the stages. (b) The order of the changes can vary for some individuals. (c) The timing of the changes is not controlled by biological maturation. But for the purpose of this paper we will dwell only on the young (or early) adulthood stage: EARLY ADULTHOOD: INTIMACY Vs ISOLATION (20-40) The challenge of this stage is to enter into committed, loving relationships with others that partially replace the bunds with parents. If the individual succeeds in this task, there is the intimacy needed to progress in adult life. If not, he/she becomes isolated and less capable of full emotional development. This is a period of vigorous health and sexuality, rich family rewards and the potential `for occupational advancement is high’. However, the early adult years is a time of increased sexual activity. This tempo is maintained till middle thirties from when the vigour decreases till late adulthood. SOCIAL CHALLENGE: Life cycles as Havighurst identifies have patterns of interactions between the individual and society. Cf. R.J. Havighurst, Developmental Tasks and Education (New York: Mckay, 1972), p.19. Robert Havighurst thus postulated three levels of developmental tasks which an individual faces in his development from early adulthood to late adulthood. At every stage of life, there are particular challenges that is societally and naturally imposed on the individual in commensuration to the age anyway. This age-graded conceptualization is known as developmental tasks. With particular reference to the young adult, Havighurst identifies the following tasks (culled from Huyck and hoyer): Taking on civic responsibilities Selecting a mate (or perhaps life partner) Learning to live with a marriage partner Starting a family Bringing up and training of children (which are the fruits of marriage) Managing a home Finding a congenial social group. Cf. M.H. Huyck and W.J. Hoyer, Adult Development and Aging (Belmont Cal: Wadsworth pub. Coy, 1982), p.18-30. COCNCLUSION From the foregoing, we have been able to deal methodically with the domains of human development, general principles and concepts of human development and the developmental challenges facing the young adult within the developmental sphere. It is also clear that every stage of human development is as important as the other for the optimum growth and development of an individual. The young adult is thus called to embrace with utmost seriousness, pleasure and elation the challenges he/she might face within this stage for they are sure to come and will aid his/her optimum growth and development and lead him/her safely and joyfully to the tomb. BIBLIOGRAPHY: Aunger, Robert and Curtis, Valerie. Gaining Control: How Human Behavior Evolved. London: Oxford University Press, 2015. Falaye O., Ajibola. Human Life Span Development: A Basic Text in Developmental Psychology. Ibadan: Stirling-Horden Publishers (Nig.) Ltd., 2001. Gergen J., Kenneth and Gergen M., Mary (Ed.). Historical Social Psychology. USA: Psychology Press, 2013. Harris, Margaret and Butterworth, George. Developmental Psychology: A Student’s Handbook. USA: Psychology Press Ltd., 2002. Havighurst, R.J. Developmental Tasks and Education. New York: Mckay, 1972. Huyck, M. H. and Hoyer, W.J. Adult Development and Aging. Belmont Cal: Wadsworth pub. Coy, 1982. Kapunan, Reyes Rocio. Educational Psychology. Philippines: REX Book Store, 1974. Karczmar, A.G. and Eccles, J.C. Brain and Human Behavior. New York: Springer-Verlag, 1972. Lassner, Joseph et al (Ed.). Social Group Work: Competence and Values in Practise. New York: Routledge, 2013. Lerner M., Richard et al (Ed.). Handbook of Child Psychology and Developmental Science. New Jersey: John Wiley & Sons Inc., 2015. Lewis, Alvin. Strategies for Educating African American Adults. Chicago: Urban Ministries Inc., 2006. Malina M., Robert et al. Growth, Maturation and Physical Activity. USA: Human Kinetics, 2004. Meggitt, Carolyn. Child Development: An Illustrated Guide. London: Heinemann Educational Publishers, 2006. Millon, Theodore et al (Ed.). Oxford Textbook of Psychopathology. New York: Oxford University Press, 1999. Nicholas (Ed.), Lionel. Introduction to Psychology. Cape Town, UCT Press, 2008. Reese W., Hayne (Ed.). Advances in Child Development and Behavior. Volume 9. London: Academic Press Inc. Ltd., 1974. INTERNET SOURCES https://www.gillmacmillan.ie/AcuCustom/Sitename/DAM/058/Human_Growth_and_Development_-_Look_Inside_Sample.pdf. http://www.nti-nigeria.org/nti-pgde/PGDE-4.pdf. CONTACT INFORMATION: E-mail Address: Michael.okpala@yahoo.com. 22