Q: New defination of adolescence A: Adolescence is the transitional period between childhood and adulthood, characterized by rapid physical, psychological, cognitive, and social development. According to the World Health Organizationhttps://www.who.int/health-topics/adolescent-health, adolescence covers the age group 10 to 19 years. It includes: - Early adolescence: 10-14 years - Late adolescence: 15-19 years During this period, puberty occurs and young people develop greater independence, identity, emotional maturity, and social relationships.