Category:Children by historical period

This meta category should only contain other categories. Files should either be in the relevant subcategory or in the parent category.

1. Babies (birth to 24 months)
2. Children (2–13 years [puberty])
3. Teenagers (13–17 years)
4. Adults (18  years)
   • Young adults (18–39 years)
   • Middle-aged people (40–59 years)
   • Old people (60  years)

Definitions come from, but are slightly modified from, the Physical stages of human life as found at Wikipedia:Human development (biology).