| Rank | Prefectures | Mean Age of Mother at 1st Child Birth | Standard Score |
|---|---|---|---|
| Sort | Desc Asc | Desc Asc | Desc Asc |
| 1 | Tokyo | 32.3歳 | 88.80 |
| 2 | Kanagawa | 31.5歳 | 73.78 |
| 3 | Kyoto | 31.1歳 | 66.26 |
| 4 | Saitama | 30.9歳 | 62.51 |
| 4 | Chiba | 30.9歳 | 62.51 |
| 6 | Hyogo | 30.7歳 | 58.75 |
| 7 | Toyama | 30.6歳 | 56.87 |
| 7 | Nagano | 30.6歳 | 56.87 |
| 7 | Osaka | 30.6歳 | 56.87 |
| 7 | Nara | 30.6歳 | 56.87 |
| 11 | Yamanashi | 30.5歳 | 54.99 |
| 11 | Aichi | 30.5歳 | 54.99 |
| 11 | Shiga | 30.5歳 | 54.99 |
| 14 | Miyagi | 30.4歳 | 53.12 |
| 14 | Niigata | 30.4歳 | 53.12 |
| 14 | Ishikawa | 30.4歳 | 53.12 |
| 14 | Shizuoka | 30.4歳 | 53.12 |
| 18 | Hokkaido | 30.3歳 | 51.24 |
| 18 | Tochigi | 30.3歳 | 51.24 |
| 20 | Akita | 30.2歳 | 49.36 |
| 20 | Ibaraki | 30.2歳 | 49.36 |
| 20 | Gunma | 30.2歳 | 49.36 |
| 20 | Gifu | 30.2歳 | 49.36 |
| 20 | Tokushima | 30.2歳 | 49.36 |
| 20 | Kochi | 30.2歳 | 49.36 |
| 20 | Fukuoka | 30.2歳 | 49.36 |
| 27 | Shimane | 30.1歳 | 47.48 |
| 27 | Hiroshima | 30.1歳 | 47.48 |
| 27 | Kagawa | 30.1歳 | 47.48 |
| 30 | Aomori | 30.0歳 | 45.60 |
| 30 | Yamagata | 30.0歳 | 45.60 |
| 30 | Fukui | 30.0歳 | 45.60 |
| 30 | Mie | 30.0歳 | 45.60 |
| 34 | Tottori | 29.9歳 | 43.73 |
| 34 | Okayama | 29.9歳 | 43.73 |
| 34 | Kagoshima | 29.9歳 | 43.73 |
| 37 | Iwate | 29.8歳 | 41.85 |
| 37 | Wakayama | 29.8歳 | 41.85 |
| 37 | Ehime | 29.8歳 | 41.85 |
| 37 | Kumamoto | 29.8歳 | 41.85 |
| 41 | Saga | 29.7歳 | 39.97 |
| 41 | Nagasaki | 29.7歳 | 39.97 |
| 41 | Oita | 29.7歳 | 39.97 |
| 44 | Okinawa | 29.6歳 | 38.09 |
| 45 | Yamaguchi | 29.5歳 | 36.21 |
| 46 | Fukushima | 29.4歳 | 34.34 |
| 47 | Miyazaki | 29.3歳 | 32.46 |
| Japan | 30.7歳 |