Ecological systems
A parent's job (exosystem), the link between home and school (mesosystem) and laws and cultural beliefs (macrosystem) shape a child as much as the family does.
Lesson · Human growth and development
Life-Span Development
From the womb to old age, people grow through biological, cognitive, social and cultural change. This lesson brings the major theories together on one timeline: Piaget, Vygotsky, Erikson, Kohlberg and Gilligan, attachment, Marcia, Bronfenbrenner, adversity and resilience, aging, and grief, with what each means for counseling at every age.
Eight life stagesTheory comparisonACEs and resilienceMatch the theoristLesson plan20-question check
Start here
Development across the life span
Choose a stage to see the main tasks, what the major theories say, common risks and what counselors do. For the prenatal period in 3D, see Lesson 6: Nature and Nurture.
Compare
The major theories side by side
| Theorist | Focus | Key stages or ideas | Critique and cultural notes |
|---|---|---|---|
| Jean Piaget | Cognition | Sensorimotor (0–2), preoperational (2–7), concrete operational (7–11), formal operational (11+); assimilation and accommodation | Children often show abilities earlier than Piaget thought; schooling and culture shape formal reasoning. |
| Lev Vygotsky | Sociocultural learning | Zone of proximal development, scaffolding, language as a tool for thinking | Centers culture and relationships in learning. |
| Erik Erikson | Psychosocial identity | Eight crises from trust vs. mistrust to integrity vs. despair | Based largely on Western, male samples; identity may be more collective in many cultures. |
| Lawrence Kohlberg | Moral reasoning | Preconventional, conventional, postconventional | Gilligan added an ethic of care; collectivist cultures may emphasize duty and harmony. |
| Carol Gilligan | Moral development and gender | Ethic of care alongside justice | Widened moral psychology beyond justice reasoning. |
| John Bowlby and Mary Ainsworth | Attachment | Secure, avoidant, ambivalent and (Main) disorganized attachment; internal working models | Caregiving networks such as grandparents and extended kin matter in many cultures. |
| James Marcia | Adolescent identity | Achievement, moratorium, foreclosure, diffusion | Ethnic-racial identity development (Phinney; Umaña-Taylor) adds a key dimension. |
| Urie Bronfenbrenner | Ecological systems | Micro, meso, exo, macro and chronosystems | Places racism, poverty and policy inside development. |
| Jeffrey Arnett | Emerging adulthood | Ages 18–29: identity exploration, instability, self-focus, feeling in-between, possibilities | Most visible where education is long and marriage is later. |
Context and culture
Development happens in context
Ethnic-racial identity
Exploring and feeling positive about one's ethnic-racial group protects youth from some effects of discrimination, which still harms adjustment (Umaña-Taylor, 2016).
Culture and milestones
Expectations for sleeping, independence, eye contact and caring for elders differ across cultures. Assess development against the family's cultural norms, not just one standard.
Neurodevelopment
Autism and ADHD begin in the developmental period. Early screening and support, with respect for neurodivergent identities, improve outcomes.
Adversity and resilience
ACEs, toxic stress and protective factors
Adverse childhood experiences include abuse, neglect and household challenges such as violence, substance use, mental illness, separation and incarceration. ACEs are common, and more ACEs mean higher risk for later physical and mental health problems. They are also preventable, and relationships buffer their effects.
What the research shows
- In a 23-state survey, about 62% of adults reported at least one ACE and about 1 in 4 reported three or more (Merrick et al., 2018).
- People with four or more ACEs face sharply higher risks for problem drinking, drug use and interpersonal violence (Hughes et al., 2017).
- Toxic stress keeps the body's stress response switched on.
Protective factors
- At least one stable, caring adult
- Secure attachment and responsive caregiving
- Safe schools and neighborhoods
- Cultural identity, faith and community connection
- Skills such as emotion regulation and problem solving
Counseling implications
- Use trauma-informed care in every setting.
- Screen thoughtfully and focus on strengths and supports.
- Address generational trauma and connect families to resources. See Career Counseling: mental health and trauma.
Later life
Aging, loss and grief
Socioemotional selectivity
Carstensen found that as time horizons shrink, older adults focus on meaningful relationships and often report more positive emotion.
Integrity and life review
Erikson's last stage is integrity versus despair. Butler's life review helps older adults find meaning in their story.
Grief models
Kübler-Ross described five stages, but grief rarely follows a fixed order. Worden describes four tasks; continuing bonds with the deceased can be healthy.
Prolonged grief disorder
Added in DSM-5-TR: intense longing or preoccupation at least 12 months after a death for adults (6 months for children), with impairment.
Practice
Match the theorist
Read each situation and choose the theory that best explains it.
Watch and read
Videos and recent research
Videos and peer-reviewed articles published in 2016 or later. Links need an internet connection.
Videos
How childhood trauma affects health across a lifetimeNadine Burke Harris · TEDMED 2014
ACEs, toxic stress and what pediatric care can do.
What do babies think?Alison Gopnik · TEDGlobal · 2011
Infants as scientists, and what that means for Piaget.
Why 30 is not the new 20Meg Jay · TED2013
Emerging adulthood as a time for intentional identity work.
Older people are happierLaura Carstensen · TEDxWomen · 2011
Socioemotional selectivity and well-being in later life.
Peer-reviewed articles
- Merrick, M. T., Ford, D. C., Ports, K. A., & Guinn, A. S. (2018). Prevalence of adverse childhood experiences from the 2011–2014 Behavioral Risk Factor Surveillance System in 23 states. JAMA Pediatrics, 172(11), 1038–1044.ACEs are common across all groups, and more common in some.https://doi.org/10.1001/jamapediatrics.2018.2537
- Hughes, K., Bellis, M. A., Hardcastle, K. A., Sethi, D., Butchart, A., Mikton, C., Jones, L., & Dunne, M. P. (2017). The effect of multiple adverse childhood experiences on health: A systematic review and meta-analysis. The Lancet Public Health, 2(8), e356–e366.Four or more ACEs sharply raise risk for many health problems.https://doi.org/10.1016/S2468-2667(17)30118-4
- Groh, A. M., Fearon, R. M. P., van IJzendoorn, M. H., Bakermans-Kranenburg, M. J., & Roisman, G. I. (2017). Attachment in the early life course: Meta-analytic evidence for its role in socioemotional development. Child Development Perspectives, 11(1), 70–76.Early attachment security predicts later social competence and fewer behavior problems.https://doi.org/10.1111/cdep.12213
- Umaña-Taylor, A. J. (2016). A post-racial society in which ethnic-racial discrimination still exists and has significant consequences for youths' adjustment. Current Directions in Psychological Science, 25(2), 111–118.Discrimination harms youth, and ethnic-racial identity can protect them.https://doi.org/10.1177/0963721415627858
- Prigerson, H. G., Boelen, P. A., Xu, J., Smith, K. V., & Maciejewski, P. K. (2021). Validation of the new DSM-5-TR criteria for prolonged grief disorder and the PG-13-Revised (PG-13-R) scale. World Psychiatry, 20(1), 96–106.Supports the new prolonged grief disorder diagnosis and a brief screening scale.https://doi.org/10.1002/wps.20823
For instructors
Lesson plan preview: One life, many theories
A ready-to-teach lesson where students follow one person across the life span through every major theory.
Sources
References
- Arnett, J. J. (2000). Emerging adulthood: A theory of development from the late teens through the twenties. American Psychologist, 55(5), 469–480.
- Broderick, P. C., & Blewitt, P. (2020). The life span: Human development for helping professionals (5th ed.). Pearson.
- Bronfenbrenner, U. (1979). The ecology of human development. Harvard University Press.
- Carstensen, L. L. (2006). The influence of a sense of time on human development. Science, 312(5782), 1913–1915.
- Erikson, E. H. (1963). Childhood and society (2nd ed.). Norton.
- Felitti, V. J., Anda, R. F., Nordenberg, D., et al. (1998). Relationship of childhood abuse and household dysfunction to many of the leading causes of death in adults. American Journal of Preventive Medicine, 14(4), 245–258.
- Gilligan, C. (1982). In a different voice. Harvard University Press.
- Groh, A. M., et al. (2017). Attachment in the early life course. Child Development Perspectives, 11(1), 70–76.
- Hughes, K., et al. (2017). The effect of multiple adverse childhood experiences on health. The Lancet Public Health, 2(8), e356–e366.
- Marcia, J. E. (1966). Development and validation of ego-identity status. Journal of Personality and Social Psychology, 3(5), 551–558.
- Merrick, M. T., et al. (2018). Prevalence of adverse childhood experiences from the 2011–2014 BRFSS in 23 states. JAMA Pediatrics, 172(11), 1038–1044.
- Worden, J. W. (2018). Grief counseling and grief therapy (5th ed.). Springer.