National Institute of Population and Social Security Research reports the average age by prefecture every year. The following shows the latest 2013 data.
Okinawa has the youngest number, and Akita has the oldest.
Figure: Average Age by Prefecture in Japan, 2013
| Rank | Prefecture | Average (-year-old) |
Median (-year-old) |
Dependency ratio *1 | ||
| Total | 0-14 | Over 65 | ||||
| 1 | Akita | 50.0 | 53.3 | 73.8 | 11.0 | 54.8 |
| 2 | Kochi | 49.1 | 51.4 | 75.3 | 11.8 | 54.6 |
| 3 | Shimane | 48.8 | 51.6 | 77.3 | 12.7 | 54.8 |
| 4 | Yamaguchi | 48.3 | 50.5 | 74.4 | 12.5 | 52.7 |
| 5 | Tokushima | 48.3 | 50.3 | 70.0 | 12.1 | 49.4 |
| 6 | Yamagata | 48.2 | 50.6 | 71.0 | 12.4 | 49.7 |
| 7 | Iwate | 47.9 | 50.2 | 69.5 | 12.3 | 48.7 |
| 8 | Wakayama | 47.9 | 49.8 | 71.8 | 12.4 | 50.5 |
| 9 | Aomori | 47.8 | 50.0 | 66.2 | 11.9 | 46.4 |
| 10 | Ehime | 47.8 | 49.4 | 70.7 | 12.7 | 49.1 |
| 11 | Niigata | 47.6 | 49.2 | 67.9 | 12.3 | 47.2 |
| 12 | Toyama | 47.5 | 48.5 | 70.3 | 12.5 | 48.9 |
| 13 | Oita | 47.4 | 49.4 | 70.9 | 12.9 | 48.8 |
| 14 | Tottori | 47.3 | 49.4 | 70.5 | 13.1 | 48.1 |
| 15 | Nagasaki | 47.3 | 49.7 | 70.0 | 13.2 | 47.4 |
| 16 | Kagoshima | 47.3 | 49.5 | 70.7 | 13.6 | 47.5 |
| 17 | Hokkaido | 47.2 | 48.5 | 63.0 | 11.6 | 44.1 |
| 18 | Nagano | 47.2 | 48.2 | 71.3 | 13.3 | 48.4 |
| 19 | Fukushima | 47.1 | 49.1 | 65.5 | 12.6 | 44.6 |
| 20 | Kagawa | 47.1 | 48.4 | 70.1 | 13.1 | 47.8 |
| 21 | Miyazaki | 47.0 | 49.2 | 70.9 | 13.8 | 47.3 |
| 22 | Kumamoto | 46.7 | 48.3 | 69.2 | 13.7 | 46.1 |
| 23 | Fukui | 46.6 | 47.6 | 68.1 | 13.6 | 45.2 |
| 24 | Yamanashi | 46.5 | 47.5 | 64.7 | 12.8 | 43.7 |
| 25 | Okayama | 46.2 | 46.6 | 68.1 | 13.4 | 45.6 |
| 26 | Nara | 46.1 | 47.1 | 65.0 | 12.7 | 44.0 |
| 27 | Saga | 46.1 | 47.4 | 67.7 | 14.3 | 43.7 |
| 28 | Gunma | 46.0 | 46.6 | 64.0 | 13.2 | 42.3 |
| 29 | Shizuoka | 46.0 | 46.7 | 64.7 | 13.3 | 42.7 |
| 30 | Mie | 46.0 | 46.6 | 65.4 | 13.4 | 43.3 |
| 31 | Ishikawa | 45.9 | 46.2 | 64.9 | 13.3 | 43.0 |
| 32 | Gifu | 45.9 | 46.6 | 66.3 | 13.6 | 43.7 |
| 33 | Hiroshima | 45.9 | 46.1 | 65.4 | 13.4 | 43.3 |
| 34 | Ibaraki | 45.6 | 46.2 | 61.0 | 13.0 | 40.0 |
| 35 | Tochigi | 45.5 | 46.1 | 59.4 | 13.1 | 38.5 |
| 36 | Kyoto | 45.5 | 45.2 | 62.0 | 12.5 | 41.8 |
| 37 | Hyogo | 45.5 | 45.7 | 63.0 | 13.3 | 41.3 |
| 38 | Miyagi | 45.2 | 45.3 | 57.7 | 12.8 | 37.5 |
| 39 | Chiba | 45.1 | 45.0 | 58.7 | 12.7 | 38.6 |
| 40 | Fukuoka | 45.0 | 45.0 | 60.4 | 13.5 | 38.8 |
| 41 | Osaka | 44.9 | 44.6 | 60.1 | 12.9 | 39.5 |
| 42 | Saitama | 44.3 | 44.2 | 56.1 | 12.9 | 35.9 |
| 43 | Tokyo | 44.3 | 43.2 | 49.7 | 11.3 | 32.8 |
| 44 | Kanagawa | 44.1 | 43.6 | 54.5 | 12.9 | 34.6 |
| 45 | Aichi | 43.6 | 43.0 | 57.3 | 14.1 | 35.1 |
| 46 | Shiga | 43.6 | 43.3 | 59.5 | 14.8 | 35.9 |
| 47 | Okinawa | 41.3 | 40.8 | 56.2 | 17.6 | 28.7 |
| Total | 45.8 | 46.0 | 61.1 | 20.7 | 40.4 | |
*1 Dependency ratio means an age-population ratio of those typically not in the labor force (the dependent part) and those typically in the labor force (the productive part). High figure means that those prefectures have much elderly people.
Source is National Institute of Population and Social Security Research. 人口統計資料集 2015年版。
www.ipss.go.jp/syoushika/tohkei/Popular/P_Detail2015.asp?fname=T12-08.htm
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