表２−６　人口の年齢構造に関する指標：1884〜2024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 指数
	0〜14歳	15〜64歳	65歳以上	(歳)	(歳)	総  数	年少人口	老年人口
1884	31.6	62.7	5.7	28.9	21.0	59.6	50.5	9.1	18.1
1888	33.7	60.8	5.5	28.2	24.5	64.5	55.5	9.0	16.3
1898	32.8	61.7	5.5	28.0	23.9	62.1	53.2	8.9	16.7
1908	34.2	60.5	5.3	27.7	24.1	65.2	56.5	8.7	15.3
1920	36.5	58.3	5.3	26.7	22.2	71.6	62.6	9.0	14.4
1921	36.7	58.0	5.2	26.7	22.1	72.4	63.3	9.0	14.3
1922	36.8	58.0	5.2	26.6	22.1	72.4	63.4	9.0	14.2
1923	36.8	58.0	5.2	26.6	22.1	72.3	63.4	8.9	14.1
1924	36.7	58.2	5.1	26.5	22.1	71.8	63.0	8.8	14.0
1925	36.7	58.2	5.1	26.5	22.0	71.7	63.0	8.7	13.8
1926	36.8	58.3	4.9	26.4	21.9	71.5	63.1	8.5	13.4
1927	36.7	58.5	4.8	26.3	21.8	71.1	62.8	8.2	13.1
1928	36.7	58.6	4.7	26.3	21.7	70.7	62.6	8.1	12.9
1929	36.6	58.7	4.7	26.3	21.7	70.3	62.3	8.0	12.9
1930	36.6	58.7	4.8	26.3	21.8	70.5	62.4	8.1	13.0
1931	36.6	58.6	4.7	26.3	21.8	70.6	62.5	8.1	12.9
1932	36.8	58.5	4.7	26.3	21.8	70.9	62.9	8.1	12.8
1933	36.9	58.3	4.8	26.3	21.8	71.5	63.3	8.2	12.9
1934	37.1	58.2	4.7	26.3	21.9	71.8	63.7	8.1	12.7
1935	36.9	58.5	4.7	26.3	22.0	71.1	63.1	8.0	12.6
1936	36.9	58.5	4.6	26.3	22.0	71.0	63.1	7.9	12.5
1937	37.1	58.2	4.7	26.4	21.9	71.8	63.7	8.1	12.7
1938	37.1	58.1	4.8	26.5	21.9	72.1	63.8	8.3	12.9
1939	36.8	58.4	4.8	26.6	22.0	71.2	63.0	8.2	13.0
1940	36.7	58.5	4.8	26.6	21.9	70.9	62.7	8.2	13.1
1947	35.3	59.9	4.8	26.6	22.1	66.9	58.9	8.0	13.6
1948	35.4	59.8	4.8	26.6	22.1	67.2	59.1	8.0	13.6
1949	35.5	59.6	4.9	26.5	22.1	67.7	59.5	8.1	13.7
1950	35.4	59.7	4.9	26.6	22.3	67.5	59.3	8.3	14.0
1951	35.1	60.0	4.9	26.7	22.4	66.7	58.5	8.2	14.1
1952	34.6	60.4	5.0	26.9	22.7	65.6	57.3	8.3	14.5
1953	34.2	60.7	5.1	27.1	23.0	64.7	56.3	8.4	14.9
1954	33.9	60.9	5.2	27.4	23.3	64.1	55.5	8.5	15.4
1955	33.4	61.3	5.3	27.6	23.7	63.1	54.4	8.7	15.9
1956	32.6	62.0	5.4	27.9	24.0	61.2	52.5	8.6	16.5
1957	31.7	62.8	5.4	28.2	24.4	59.1	50.5	8.6	17.1
1958	31.0	63.5	5.5	28.5	24.8	57.5	48.8	8.7	17.8
1959	30.2	64.2	5.6	28.8	25.2	55.8	47.1	8.7	18.5
1960	30.0	64.2	5.7	29.1	25.6	55.7	46.8	8.9	19.1
1961	29.8	64.4	5.8	29.3	26.0	55.3	46.2	9.1	19.6
1962	28.7	65.4	5.9	29.6	26.4	52.9	43.8	9.1	20.7
1963	27.5	66.5	6.1	29.9	26.7	50.5	41.3	9.1	22.1
1964	26.3	67.5	6.2	30.1	27.1	48.2	39.0	9.2	23.5
1965	25.6	68.1	6.3	30.4	27.5	46.8	37.6	9.2	24.6
1966	24.8	68.8	6.5	30.7	27.9	45.4	36.0	9.4	26.2
1967	24.4	69.0	6.6	30.9	28.1	44.9	35.3	9.6	27.3
1968	24.1	69.1	6.8	31.1	28.4	44.7	34.8	9.8	28.2
1969	24.0	69.1	6.9	31.3	28.7	44.7	34.7	10.0	28.9
1970	23.9	69.0	7.1	31.5	29.1	44.9	34.7	10.2	29.5
1971	24.0	68.9	7.2	31.7	29.4	45.2	34.8	10.4	29.9
1972	24.2	68.5	7.3	31.9	29.7	46.1	35.3	10.7	30.3
1973	24.3	68.2	7.5	32.0	29.9	46.7	35.7	11.0	30.9
1974	24.4	67.9	7.7	32.2	30.2	47.2	35.9	11.3	31.5
1975	24.3	67.7	7.9	32.5	30.6	47.6	35.9	11.7	32.6
1976	24.3	67.6	8.1	32.7	30.8	48.0	36.0	12.0	33.5
1977	24.2	67.4	8.4	33.0	31.0	48.4	35.9	12.4	34.6
1978	24.1	67.3	8.6	33.3	31.5	48.5	35.7	12.8	35.8
1979	23.8	67.3	8.9	33.6	32.0	48.6	35.4	13.2	37.3
1980	23.5	67.4	9.1	33.9	32.5	48.4	34.9	13.5	38.7
1981	23.4	67.2	9.3	34.3	33.1	48.7	34.8	13.9	39.9
1982	23.0	67.5	9.6	34.6	33.6	48.2	34.0	14.2	41.6
1983	22.5	67.7	9.8	35.0	34.2	47.7	33.3	14.4	43.4
1984	22.0	68.0	9.9	35.3	34.7	47.0	32.4	14.6	45.1
1985	21.5	68.2	10.3	35.7	35.2	46.7	31.6	15.1	47.9
1986	20.9	68.5	10.6	36.0	35.7	45.9	30.5	15.4	50.6
1987	20.2	68.9	10.9	36.4	36.2	45.2	29.4	15.8	53.8
1988	19.5	69.2	11.2	36.8	36.7	44.4	28.2	16.2	57.5
1989	18.8	69.6	11.6	37.2	37.1	43.7	27.1	16.7	61.7
1990	18.2	69.7	12.1	37.6	37.7	43.5	26.2	17.3	66.2
1991	17.7	69.8	12.6	38.0	38.1	43.3	25.3	18.0	71.1
1992	17.2	69.8	13.1	38.4	38.5	43.3	24.6	18.7	76.0
1993	16.7	69.8	13.5	38.8	38.9	43.4	23.9	19.4	81.1
1994	16.3	69.6	14.1	39.2	39.3	43.7	23.5	20.2	86.1
1995	16.0	69.5	14.6	39.6	39.7	43.9	23.0	20.9	91.2
1996	15.6	69.3	15.1	39.9	40.1	44.4	22.6	21.8	96.6
1997	15.3	69.0	15.7	40.3	40.4	44.9	22.2	22.7	102.0
1998	15.1	68.7	16.2	40.7	40.7	45.5	21.9	23.6	107.6
1999	14.8	68.5	16.7	41.0	41.0	46.0	21.6	24.4	113.0
2000	14.6	68.1	17.4	41.4	41.5	46.9	21.4	25.5	119.1
2001	14.4	67.7	18.0	41.8	41.8	47.8	21.2	26.5	125.1
2002	14.2	67.3	18.5	42.1	42.1	48.7	21.1	27.6	130.5
2003	14.0	66.9	19.0	42.5	42.4	49.4	21.0	28.5	135.8
2004	13.9	66.6	19.5	42.9	42.7	50.1	20.8	29.2	140.3
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	152.6
2007	13.5	65.0	21.5	44.0	43.9	53.9	20.8	33.1	158.8
2008	13.5	64.5	22.1	44.3	44.2	55.2	20.9	34.3	164.3
2009	13.3	63.9	22.7	44.6	44.6	56.5	20.9	35.6	170.5
2010	13.1	63.8	23.0	45.0	45.0	56.7	20.6	36.1	175.1
2011	13.1	63.6	23.3	45.3	45.3	57.1	20.5	36.6	178.1
2012	13.0	62.9	24.1	45.6	45.6	59.0	20.6	38.4	186.1
2013	12.9	62.1	25.1	45.8	46.0	61.1	20.7	40.4	194.6
2014	12.8	61.3	26.0	46.1	46.4	63.2	20.9	42.4	203.3
2015	12.5	60.8	26.6	46.4	46.7	64.5	20.6	43.8	212.4
2016	12.4	60.4	27.2	46.7	47.1	65.7	20.6	45.1	218.6
2017	12.3	60.0	27.6	46.9	47.4	66.6	20.5	46.1	224.3
2018	12.2	59.8	28.0	47.1	47.7	67.2	20.4	46.8	229.3
2019	12.1	59.7	28.3	47.4	48.1	67.5	20.2	47.3	234.3
2020	11.9	59.5	28.6	47.6	48.5	68.0	20.0	48.0	239.7
2021	11.8	59.4	28.9	47.9	49.0	68.5	19.8	48.6	245.0
2022	11.6	59.4	29.0	48.2	49.4	68.4	19.5	48.8	249.9
2023	11.4	59.5	29.1	48.4	49.7	68.2	19.2	49.0	255.6
2024	11.2	59.6	29.3	48.6	50.1	67.9	18.8	49.2	262.1
表2-5の人口に対応する。年齢不詳人口を年齢別に按分した人口による。年少（従属）人口指数は0〜14歳人口の15〜64歳人口に対する比率，老年（従属）人口指数は65歳以上人口の同じく15〜64歳人口に対する比率，従属人口指数（総数）はそれらの和。また，老年化指数は65歳以上人口の0〜14歳人口に対する比率で，各指数とも，それぞれ分母人口100について。なお，中位数年齢とは人口を年齢順に並べて数え，ちょうどまん中にあたる人の年齢。平均年齢および中位数年齢は，各歳別人口に基づき算定した。