In order to acquire a thorough understanding of the nature of human development over time scientists have divided the life span into five periods. These divisions are?

The five periods of human development are: infancy (0-2 years), early childhood (2-6 years), middle childhood (6-12 years), adolescence (12-18 years), and adulthood (18 years and older). Each stage is associated with specific physical, cognitive, emotional, and social changes that individuals experience as they grow and develop.