This document discusses human developmental stages from conception through late adulthood. It describes 8 major developmental stages, including pre-natal, infancy, early childhood, late childhood, adolescence, early adulthood, middle age, and old age. For each stage, key characteristics and developmental tasks are outlined. Developmental tasks refer to skills and responsibilities acquired at each life phase. Tables summarize developmental tasks for infancy/early childhood, middle childhood, adolescence, early adulthood, middle adulthood, and later maturity. The document emphasizes that development is a continuous lifelong process of growth and change.