| Stage | Age Range |
|---|---|
| Prenatal | Conception to birth |
| Infancy and toddlerhood | Birth to 2 years |
| Early childhood | 2 to 6 years |
| Middle childhood | 6 to 12 years |
| Adolescence | 12 to 18 years |
| Emerging adulthood | 18 to 25 years |
| Young adulthood | 25 to 40 years |
| Middle adulthood | 40 to 65 years |
| Late adulthood | 65 years to death |