Infancy:
Younger than 1 month | 2 months | 4 months |
6 months | 9 months | 12 months |
Early childhood:
15 months | 18 months | 24 months |
30 months | 3 years | 4 years |
Middle childhood:
5 years | 6 years | 7 years |
8 years | 9 years | 10 years |
Adolescence and young adults:
11 years | 12 years | 13 years |
14 years | 15 years | 16 years |
17 years | 18 years | 19 years |
20 years | 21 years (through the enrollee’s 21st birth month) |