Lifespan Development: Adolescence and Adulthood

Lifespan Development: Adolescence and Adulthood

Adolescent Development

Adolescence marks the transition from childhood to adulthood, beginning with the onset of sexual maturity and ending with the attainment of adult social status. This period is characterized by significant physical, cognitive, and social changes.

Physical Development

• Puberty: The process of sexual maturation, typically marking the start of adolescence.

• Hallmarks of Puberty:

  • First ejaculation in boys (usually ages 12-14)

  • First menstruation in girls (usually ages 12-12.5)

• Trends: Puberty is starting earlier in recent generations, possibly due to environmental factors such as pesticides, medications, hormones in food, and birth control pills.

Cognitive Development

• Reasoning Abilities: Adolescents develop metacognition (the ability to think about their own thinking) and can consider others' perspectives.

• Egocentrism: Adolescents often believe they are the focus of others' attention (imaginary audience).

• Personal Fable: The belief that one is unique and invulnerable (e.g., "It won't happen to me").

• Prefrontal Lobe Development: The prefrontal cortex, responsible for decision making and impulse control, is not fully developed, leading to increased risk-taking behavior.

Moral Reasoning Development: Kohlberg’s Theory

Lawrence Kohlberg proposed a stage theory of moral development, based on responses to moral dilemmas.

• Preconventional Level:

  • Decisions based on personal consequences (e.g., avoiding punishment or gaining rewards).

  • Example: "You should steal the medicine because you can get away with it."

• Conventional Level:

  • Decisions based on social approval or law and order.

  • Example: "Others would look down on him if he let his wife die."

• Postconventional Level:

  • Decisions based on abstract principles and the value of human life.

  • Example: "Protection of human life is more important than the law."

Social Development in Adolescence

• Identity Formation (Erikson): Adolescents synthesize past, present, and future possibilities to form a clear sense of self.

• Erikson’s Stage: Identity vs. Role Confusion—the challenge of developing a stable and satisfying sense of identity and direction.

• Identity Statuses:

  • Identity Foreclosure: Premature commitment to an identity without adequate exploration.

  • Identity Diffusion: Lack of direction or commitment regarding identity.

  • Psychosocial Moratorium: A period of exploration without commitment, often leading to confusion.

  • Identity Achievement: High exploration and commitment to a chosen identity.

Developmental Stage Theories Overview

Theorist	Stages
Lawrence Kohlberg	Preconventional → Conventional → Postconventional
Erik Erikson	Basic Trust → Autonomy → Initiative → Competence → Identity → Intimacy → Generativity → Integrity
Jean Piaget	Sensorimotor → Preoperational → Concrete Operational → Formal Operational

Adult Development

Adulthood involves continued cognitive and social changes, including memory decline and evolving social roles.

Cognitive Changes

• Memory Decline: Some aspects of memory, especially recall, decline with age.

• Potential Disorders: Degenerative diseases such as Alzheimer's disease can cause deterioration of memory and reasoning abilities.

Social Development in Adulthood

• Social Clock: Cultural expectations regarding the timing of major life milestones (e.g., marriage, parenthood, career, retirement).

• Attachment Styles in Adulthood:

  • Secure/Autonomous: Comfortable with intimacy and independence; able to seek help when needed.

  • Anxious/Preoccupied: Worry about relationships and possible rejection.

  • Dismissive/Avoidant: Prefer independence, may avoid closeness or vulnerability.

• Lifestyle Changes: Adjustments due to empty nest, retirement, changes in physical abilities, and financial status.

• Well-being: Contrary to stereotypes, most older adults report high life satisfaction.

Socioemotional Selectivity Theory

• As people age, they become more selective with their social interactions and energy.

• Focus shifts toward building close, emotionally meaningful relationships.

• Increased capacity for emotional regulation and well-being.

• Older adults tend to avoid negative stimuli and focus on the positive.

Example: An older adult may choose to spend more time with close family and friends, rather than seeking out new acquaintances, prioritizing emotional satisfaction over novelty.

Additional info: Theories and stages mentioned are foundational in developmental psychology and are frequently tested in introductory psychology courses.