| Birth cohort | Age at first sex | Age at first marriage | ||
| All data | Reliable data | All data | Reliable data | |
| Median (IQR) | Median (IQR) | Median (IQR) | Median (IQR) | |
| Men | ||||
| 1950–9 | 20.1 (18.3–22.4) | 19.9 (18.0–22.2) | 24.5 (22.0–27.0) | 24.6 (21.9–27.0) |
| 1960–9 | 19.6 (17.9–21.6) | 19.5 (17.8–21.7) | 24.7 (22.0–27.4) | 25.0 (22.0–27.7) |
| 1970–9 | 19.0 (17.3–20.9) | 19.0 (17.2–20.9) | 23.2 (21.2–25.2) | 23.4 (21.3–25.4) |
| Women | ||||
| 1950–9 | 19.0 (17.3–20.6) | 18.9 (17.2–20.5) | 19.1 (17.4–20.8) | 18.9 (17.2–20.7) |
| 1960–9 | 18.7 (17.0–20.6) | 18.7 (17.0–20.6) | 18.9 (17.2–20.9) | 18.8 (17.0–20.8) |
| 1970–9 | 19.0 (17.4–20.8) | 19.0 (17.5–20.8) | 19.3 (17.7–21.1) | 19.3 (17.7–21.2) |
IQR, interquartile range.