Population below 20 years old  Average 552,355 people

Worst 1; Tottori 130,333 Shimane 155,448 Kouchi 157,615 Tokushima 165,120 Fukui 177,596

Worst 2; Yamanashi 189,753 Saga 201,133 Kagawa 205,921 Toyama 216,799 Akita 229,361

Best 1; Tokyo 2,061,014 Osaka 1,751,061 Kanagawa 1,662,987 Aichi 1,497,503 Saitama 1,443,450

Best 2; Chiba 1,197,507 Hyogo 1,157,802 Hokkaido 1,134,195 Fukuoka 1,071,424 Shizuoka 782,215

Total 22,233,713 people (Inside 15-19 years old 7,488,165 people)