Category:Nude boys holding hands

Children (birth until 17 years)

Babies (birth to ~24 months)

Toddlers (~2 to 4 years)

Preteens (~10 to 12 years)

Adolescent children (~13 to 17 years)

Adults (18 years until death)

Young adults (~18 to 40 years)

Middle-aged adults (~40 to 60 years)

Old adults (~60 years until death)

Definitions come from, but are slightly modified from, the English Wikipedia articles on the development of the human body.