1. Prenatal - fertilization to birth
2. Infancy - birth to 2 weeks of life
3. Babyhood - 2 weeks of life to 2 years old
4. Early childhood - 2 to 6 years old
5. Late childhood - 6 to 10 or 12 years old
6. Puberty - 10 or 12 to 14 years old
7. Adolescence - 14 to 18 years old
8. Early adulthood - 18 to 40 years old
9. Middle adulthood - 40 to 60 years old
10. Late adulthood or senescence - 60 years old to death