Median age at entry and discharge, by length of service
| Length of service | Median age at entry (years) | IQR | Median age at discharge (years) | IQR |
| All veterans | 18.2 | 17.0–20.6 | 26.2 | 21.8–33.0 |
| Basic training | 19.5 | 17.5–24.0 | 19.7 | 17.7–24.1 |
| Trained ESL | 18.5 | 17.2–21.2 | 20.8 | 18.8–23.4 |
| 4–12 years | 18.2 | 17.0–20.3 | 26.4 | 23.8–29.1 |
| Over 12 years | 17.7 | 15.0–19.6 | 40.1 | 35.0–43.4 |
Basic training—left before completing initial training; trained ESL (completed training).
ESL, early service leaver.