| 表２−８ 将来推計人口の年齢構造に関する指標：2005〜55年 | |||||||||||
| 年次 | 人口割合 （％） | 平均年齢 | 中位数年齢 | 従属人口指数 | 老年化 | ||||||
| 0〜14歳 | 15〜64歳 | 65歳以上 | (歳) | (歳) | 総 数 | 年少人口 | 老年人口 | 指数 | |||
| 2005 | 13.8 | 66.1 | 20.2 | 43.3 | 43.3 | 51.3 | 20.8 | 30.5 | 146.5 | ||
| 2006 | 13.6 | 65.5 | 20.8 | 43.7 | 43.6 | 52.6 | 20.8 | 31.8 | 152.5 | ||
| 2007 | 13.5 | 65.0 | 21.5 | 44.0 | 43.9 | 53.8 | 20.8 | 33.1 | 159.2 | ||
| 2008 | 13.3 | 64.5 | 22.1 | 44.4 | 44.3 | 54.9 | 20.7 | 34.3 | 165.7 | ||
| 2009 | 13.2 | 64.1 | 22.8 | 44.7 | 44.7 | 56.0 | 20.5 | 35.5 | 172.9 | ||
| 2010 | 13.0 | 63.9 | 23.1 | 45.1 | 45.1 | 56.5 | 20.3 | 36.2 | 178.5 | ||
| 2011 | 12.8 | 63.8 | 23.4 | 45.4 | 45.4 | 56.7 | 20.0 | 36.7 | 183.4 | ||
| 2012 | 12.5 | 63.2 | 24.3 | 45.8 | 45.7 | 58.3 | 19.9 | 38.4 | 193.6 | ||
| 2013 | 12.3 | 62.5 | 25.2 | 46.1 | 46.1 | 60.1 | 19.7 | 40.4 | 204.9 | ||
| 2014 | 12.1 | 61.8 | 26.2 | 46.4 | 46.5 | 61.9 | 19.6 | 42.4 | 216.7 | ||
| 2015 | 11.8 | 61.2 | 26.9 | 46.8 | 46.9 | 63.3 | 19.3 | 44.0 | 227.6 | ||
| 2020 | 10.8 | 60.0 | 29.2 | 48.3 | 49.0 | 66.7 | 17.9 | 48.8 | 271.9 | ||
| 2025 | 10.0 | 59.5 | 30.5 | 49.7 | 51.2 | 68.1 | 16.8 | 51.2 | 304.1 | ||
| 2030 | 9.7 | 58.5 | 31.8 | 50.9 | 53.0 | 70.9 | 16.5 | 54.4 | 328.9 | ||
| 2035 | 9.5 | 56.8 | 33.7 | 51.8 | 54.3 | 75.9 | 16.7 | 59.2 | 354.4 | ||
| 2040 | 9.3 | 54.2 | 36.5 | 52.7 | 55.4 | 84.3 | 17.2 | 67.2 | 391.8 | ||
| 2045 | 9.0 | 52.8 | 38.2 | 53.5 | 56.3 | 89.5 | 17.0 | 72.5 | 425.1 | ||
| 2050 | 8.6 | 51.8 | 39.6 | 54.3 | 57.0 | 93.0 | 16.7 | 76.4 | 458.2 | ||
| 2055 | 8.4 | 51.1 | 40.5 | 55.0 | 57.8 | 95.7 | 16.4 | 79.4 | 485.2 | ||
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