Adolescence spans from ages 10 to 24, with some experts extending it. Teens can legally drive at 16, but cannot rent cars until 25. Voting is allowed at 18, drinking is prohibited until 21
Pre-teens experience rapid growth spurts and secondary sexual characteristics. Motor skills and coordination improve during this period
Males have an extra Y chromosome (47,XYY). Condition occurs in about 1 in 1,000 male births. Usually no symptoms, including increased height and learning difficulties. Not inherited, occurs randomly during sperm development
Preadolescence spans ages 9-12, ending with puberty. Term "tween" combines "teen" and "between" for 9-12-year-olds. Puberty onset has been one year earlier since 1950s
Young adult refers to people between 18 and 40 years. Census Bureau defines it as ages 18-34. Some definitions extend to early to mid 40s
Erikson developed eight stages from infancy to late adulthood. Theory combines biological and sociocultural forces in development. Each stage presents a psychosocial crisis between conflicting forces. Successful resolution leads to corresponding virtues