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)