- 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.
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