| Infancy | 0 to 2 years |
| Early childhood | 2 to 6 years |
| Middle childhood | 6 to 11 years |
| Adolescence | 11 to 18 years |
| Emerging Adulthood | 18 to 25 years |
| Adulthood | 25 to 65 years |
| Late adulthood | 65 years and older |
| As you will learn, developmentalists are reluctant to specify chronological ages for any period of development, since time is only one of many variables that affect each person. However, age is a crucial variable, and development can be segmented into periods of study. Approximate ages for each period are given here. | |