Category:Male babies in 2004 by country

Children (birth to ~18 years)

Babies (birth to ~4 years)

Preteens (9 to ~13 years)

Teenagers (13 to ~18 years)

Adults (18 years till death)

Young adults (18 to ~40 years)

Middle-aged (40 to ~60 years)

Old (60 years till death)

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