What developmental age group generally spans from 12 to 20 years?

The developmental age group that spans from 12 to 20 years is known as adolescence. This stage is characterized by significant physical, emotional, and social changes as individuals transition from childhood to adulthood. During adolescence, individuals experience puberty, develop more complex reasoning skills, and begin to establish their identities and independence. This period is crucial for emotional development, as adolescents often begin to explore relationships, personal beliefs, and societal roles.

In contrast, infancy refers to the earliest stage of life, from birth to around one year, during which rapid physical growth and foundational cognitive skills occur. The toddler stage, typically covering ages one to three, is marked by early motor skills development and language acquisition. The school-age group, usually identified as ages six to twelve, focuses on educational growth and social interaction, where children learn to navigate more complex friendships and begin structured schooling. Each of these stages has distinct characteristics that set them apart from the adolescent phase.