Educational psychology is concerned with the scientific study of human learning. The document discusses adolescent development, which occurs between ages 11-19, known as the teenage years. There are three aspects of adolescent development: physical, cognitive, and psycho-social. Physically, adolescents experience changes leading to sexual maturity like growth spurts and puberty. Cognitively, they develop advanced reasoning and abstract thinking skills. Psycho-socially, adolescents establish identity and independence from parents through developing intimacy in relationships.