Age distribution of mothers at birth in Japan

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This page gives information of type age distribution of mothers at birth about the country Japan.
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Mean age at birth

The mean age at birth is a period measure based on all births in a given year.

Year Mean age at birth (all birth orders) MAB1 MAB2 MAB3 MAB4 MAB5+ MAB40 MAB40_1 MAB40_2 MAB40_3 MAB40_4 MAB40_5+
1947 30.47 29.59
1948 30.19 29.28
1949 29.92 29.16
1950 29.62 28.95
1951 29.54 28.94
1952 29.38 28.85
1953 29.2 28.73
1954 29.03 28.61
1955 28.85 28.47
1956 28.64 28.3
1957 28.44 28.14
1958 28.22 27.96
1959 28.06 27.83
1960 27.89 27.69
1961 27.81 27.63
1962 27.71 27.56
1963 27.71 27.58
1964 27.7 27.58
1965 27.7 27.59
1966 27.66 27.53
1967 27.76 27.67
1968 27.79 25.9 28.58 30.72 32.56 35.8 27.69 25.84 28.53 30.62 32.2 34.38
1969 27.8 25.87 28.53 30.74 32.54 35.69 27.7 25.81 28.48 30.64 32.2 34.3
1970 27.76 25.81 28.48 30.77 32.56 35.51 27.67 25.76 28.43 30.67 32.22 34.19
1971 27.74 25.75 28.43 30.73 32.55 35.36 27.65 25.7 28.37 30.63 32.23 34.09
1972 27.66 25.67 28.36 30.69 32.51 35.38 27.57 25.61 28.3 30.59 32.18 34.16
1973 27.64 25.63 28.28 30.65 32.46 35.16 27.55 25.58 28.22 30.55 32.15 34.08
1974 27.54 25.62 28.18 30.59 32.49 35.3 27.45 25.57 28.13 30.49 32.17 34.1
1975 27.47 25.68 28.16 30.51 32.46 35.26 27.39 25.63 28.11 30.4 32.13 34.11
1976 27.49 25.76 28.15 30.43 32.35 35.29 27.41 25.71 28.1 30.33 32.01 34.08
1977 27.58 25.88 28.21 30.39 32.33 35.29 27.5 25.83 28.17 30.29 32 34.07
1978 27.65 25.95 28.28 30.39 32.36 35.19 27.57 25.91 28.23 30.3 32.01 34
1979 27.7 26.01 28.36 30.41 32.29 35.33 27.63 25.97 28.32 30.33 31.95 34.08
1980 27.75 26.07 28.44 30.51 32.35 35.21 27.68 26.03 28.39 30.43 32.02 33.96
1981 27.83 26.16 28.54 30.62 32.39 35.16 27.76 26.12 28.49 30.54 32.04 33.93
1982 27.92 26.24 28.59 30.73 32.5 35.17 27.85 26.19 28.55 30.64 32.16 33.96
1983 28.02 26.3 28.68 30.86 32.6 35.12 27.95 26.26 28.64 30.78 32.29 33.92
1984 28.12 26.37 28.74 30.94 32.73 35.08 28.05 26.33 28.7 30.85 32.4 33.96
1985 28.26 26.5 28.83 31.02 32.83 35.09 28.19 26.46 28.78 30.93 32.51 34.02
1986 28.38 26.64 28.92 31.11 32.95 35.05 28.31 26.6 28.87 31.03 32.64 33.97
1987 28.52 26.78 29.03 31.23 32.99 35.24 28.45 26.74 28.97 31.14 32.68 34.2
1988 28.68 26.9 29.17 31.35 33.21 35.26 28.59 26.85 29.11 31.25 32.88 34.2
1989 28.81 27.03 29.32 31.5 33.32 35.29 28.72 26.97 29.25 31.39 32.97 34.28
1990 28.94 27.15 29.46 31.62 33.43 35.33 28.84 27.09 29.38 31.51 33.1 34.35
1991 29 27.23 29.58 31.75 33.53 35.36 28.9 27.17 29.5 31.63 33.16 34.39
1992 29.09 27.37 29.67 31.87 33.68 35.43 28.99 27.31 29.59 31.74 33.29 34.45
1993 29.19 27.51 29.79 32 33.78 35.54 29.08 27.44 29.7 31.85 33.36 34.55
1994 29.29 27.64 29.9 32.09 33.88 35.64 29.18 27.57 29.81 31.93 33.44 34.6
1995 29.39 27.75 30 32.16 33.96 35.73 29.26 27.68 29.9 31.98 33.48 34.65
1996 29.5 27.89 30.14 32.23 34.01 35.72 29.37 27.8 30.04 32.05 33.5 34.66
1997 29.57 27.95 30.26 32.32 34.05 35.72 29.43 27.85 30.15 32.11 33.53 34.58
1998 29.63 27.99 30.38 32.4 34.12 35.91 29.47 27.89 30.27 32.18 33.54 34.66
1999 29.65 28.01 30.49 32.47 34.18 35.81 29.48 27.9 30.36 32.24 33.58 34.57
2000 29.68 28.03 30.54 32.55 34.29 35.79 29.5 27.92 30.4 32.3 33.65 34.57
2001 29.68 28.05 30.54 32.59 34.33 35.81 29.49 27.93 30.39 32.33 33.68 34.59
2002 29.71 28.15 30.59 32.64 34.35 35.94 29.51 28.02 30.43 32.35 33.65 34.61
2003 29.83 28.36 30.61 32.61 34.34 35.91 29.61 28.21 30.44 32.3 33.61 34.65
2004 29.93 28.51 30.69 32.59 34.26 35.92 29.7 28.35 30.5 32.27 33.53 34.59
2005 30 28.63 30.76 32.53 34.2 35.86 29.76 28.45 30.55 32.19 33.46 34.48
2006 30.09 28.72 30.88 32.55 34.12 35.77 29.84 28.53 30.66 32.19 33.34 34.39
2007 30.24 28.87 31.02 32.59 34.03 35.62 29.96 28.66 30.78 32.22 33.24 34.25
2008 30.31 28.95 31.09 32.58 33.93 35.55 30.02 28.73 30.83 32.21 33.13 34.18
2009 30.44 29.13 31.22 32.64 33.89 35.33 30.13 28.89 30.93 32.25 33.13 33.98
Average (1968-2009) 28.7445238095 27.0573809524 29.4254761905 31.515952381 33.2783333333 35.4742857143 28.6154761905 26.9728571429 29.3273809524 31.3488095238 32.82 34.2807142857
Median (1968-2009) 28.745 26.965 29.245 31.425 33.265 35.37 28.655 26.91 29.18 31.32 32.925 34.225
Standard deviation (1968-2009) 0.9693427554 1.1172135624 1.0141900586 0.8534751329 0.7638890121 0.2786390519 0.9102082377 1.0695572043 0.9542512312 0.7685564625 0.628086525 0.2520490937
Slope for best linear fit (using linear regression) 0.0766850336 0.0893955109 0.079628069 0.0656907868 0.0573608298 0.0126505145 0.072007941 0.085704562 0.0749380115 0.0586330119 0.0451438295 0.0116351997
Multiplier for best logarithm fit (using linear fit on logarithm) 1.0026655941 1.003298838 1.002699542 1.0020836461 1.0017242967 1.000356136 1.002516574 1.0031751711 1.0025509791 1.0018713788 1.0013775446 1.000338998
R^2 for linear regression 0.9418960745 0.963597186 0.9277483064 0.8915869093 0.8486074179 0.3102193711 0.9419237822 0.9663542144 0.9281440216 0.8759298983 0.7774891586 0.3207110369

Standard deviation in age of birth

Year sdMAB sdMAB1 sdMAB2 sdMAB3 sdMAB4 sdMAB5+ sdMAB40 sdMAB40_1 sdMAB40_2 sdMAB40_3 sdMAB40_4 sdMAB40_5+
1947 6.03 5.22
1948 6.14 5.33
1949 5.91 5.2
1950 5.77 5.12
1951 5.63 5.03
1952 5.49 4.92
1953 5.36 4.84
1954 5.25 4.76
1955 5.12 4.67
1956 5.01 4.58
1957 4.85 4.45
1958 4.71 4.34
1959 4.59 4.24
1960 4.42 4.11
1961 4.29 4.02
1962 4.19 3.95
1963 4.14 3.92
1964 4.1 3.9
1965 4.06 3.88
1966 4.22 4.01
1967 3.99 3.84
1968 4.03 3.52 3.43 3.45 3.84 4.41 3.87 3.4 3.33 3.3 3.42 3.4
1969 4.03 3.52 3.44 3.45 3.8 4.42 3.87 3.39 3.34 3.31 3.41 3.39
1970 4.03 3.51 3.43 3.45 3.82 4.4 3.88 3.38 3.32 3.3 3.43 3.42
1971 4.02 3.51 3.4 3.43 3.79 4.39 3.87 3.38 3.29 3.28 3.42 3.43
1972 4.03 3.49 3.39 3.42 3.81 4.34 3.87 3.36 3.29 3.28 3.43 3.43
1973 4.03 3.48 3.41 3.42 3.79 4.25 3.88 3.35 3.31 3.28 3.43 3.41
1974 4 3.45 3.4 3.43 3.85 4.36 3.85 3.33 3.3 3.28 3.48 3.48
1975 3.94 3.45 3.37 3.48 3.92 4.34 3.8 3.33 3.27 3.32 3.56 3.5
1976 3.88 3.43 3.32 3.45 3.96 4.39 3.74 3.32 3.23 3.3 3.57 3.54
1977 3.84 3.43 3.3 3.43 3.92 4.41 3.7 3.32 3.21 3.27 3.54 3.53
1978 3.81 3.42 3.27 3.36 3.94 4.42 3.68 3.32 3.19 3.21 3.54 3.6
1979 3.8 3.42 3.26 3.32 3.9 4.45 3.67 3.33 3.18 3.19 3.51 3.58
1980 3.81 3.45 3.27 3.31 3.86 4.48 3.69 3.36 3.19 3.16 3.49 3.64
1981 3.84 3.48 3.31 3.29 3.86 4.47 3.72 3.39 3.23 3.15 3.46 3.61
1982 3.86 3.5 3.33 3.28 3.81 4.41 3.74 3.41 3.24 3.14 3.42 3.53
1983 3.89 3.55 3.34 3.28 3.74 4.37 3.77 3.46 3.26 3.14 3.38 3.48
1984 3.92 3.58 3.38 3.28 3.72 4.3 3.8 3.49 3.3 3.14 3.34 3.46
1985 3.94 3.63 3.42 3.31 3.69 4.24 3.82 3.54 3.33 3.17 3.32 3.42
1986 3.96 3.66 3.46 3.31 3.7 4.24 3.85 3.57 3.38 3.19 3.36 3.4
1987 3.98 3.69 3.47 3.34 3.7 4.18 3.86 3.6 3.38 3.21 3.36 3.39
1988 4.02 3.75 3.51 3.36 3.68 4.17 3.9 3.65 3.42 3.22 3.33 3.36
1989 4.09 3.82 3.57 3.41 3.67 4.15 3.96 3.72 3.47 3.26 3.31 3.4
1990 4.14 3.89 3.61 3.44 3.67 4.04 4 3.79 3.5 3.28 3.33 3.32
1991 4.18 3.93 3.65 3.47 3.73 4.1 4.04 3.82 3.54 3.3 3.36 3.41
1992 4.23 3.98 3.73 3.52 3.75 4.09 4.09 3.88 3.61 3.35 3.39 3.4
1993 4.27 4.04 3.77 3.57 3.78 4.06 4.13 3.93 3.66 3.38 3.38 3.39
1994 4.32 4.1 3.82 3.64 3.84 4.12 4.17 3.99 3.7 3.44 3.44 3.45
1995 4.38 4.18 3.88 3.71 3.9 4.08 4.22 4.07 3.75 3.5 3.48 3.36
1996 4.42 4.24 3.92 3.75 3.95 4.08 4.25 4.12 3.79 3.54 3.52 3.39
1997 4.49 4.34 3.98 3.82 3.99 4.21 4.32 4.2 3.84 3.59 3.55 3.46
1998 4.56 4.42 4.04 3.85 4.06 4.23 4.38 4.28 3.89 3.62 3.58 3.44
1999 4.64 4.5 4.1 3.9 4.11 4.27 4.45 4.36 3.94 3.67 3.64 3.5
2000 4.73 4.61 4.17 3.95 4.14 4.26 4.53 4.46 4.01 3.7 3.65 3.5
2001 4.81 4.71 4.27 4.03 4.16 4.27 4.61 4.55 4.1 3.78 3.66 3.51
2002 4.88 4.79 4.35 4.1 4.26 4.32 4.67 4.62 4.17 3.83 3.74 3.54
2003 4.91 4.85 4.43 4.19 4.32 4.29 4.68 4.66 4.24 3.9 3.79 3.52
2004 4.94 4.91 4.49 4.27 4.36 4.34 4.71 4.71 4.29 3.98 3.83 3.58
2005 4.96 4.94 4.54 4.33 4.43 4.46 4.72 4.72 4.33 4.03 3.9 3.66
2006 4.98 4.96 4.56 4.37 4.53 4.54 4.73 4.74 4.34 4.06 3.97 3.76
2007 5.01 5 4.6 4.4 4.59 4.61 4.74 4.77 4.37 4.08 4.03 3.8
2008 5.04 5.04 4.65 4.42 4.61 4.59 4.76 4.8 4.4 4.1 4.03 3.77
2009 5.06 5.07 4.68 4.43 4.59 4.68 4.77 4.81 4.41 4.1 4.04 3.84
Average (1968-2009) 4.2785714286 4.0057142857 3.7552380952 3.6528571429 3.9652380952 4.315 4.1133333333 3.8733333333 3.6271428571 3.4602380952 3.5433333333 3.5
Median (1968-2009) 4.06 3.785 3.54 3.45 3.86 4.33 3.93 3.685 3.445 3.3 3.48 3.47
Standard deviation (1968-2009) 0.4227065604 0.5798786368 0.4657552906 0.37805204 0.2774556708 0.1566143313 0.3781512581 0.5407387299 0.4160574873 0.3143439789 0.209210673 0.124997561
Slope for best linear fit (using linear regression) 0.030493477 0.0444469654 0.0345887691 0.0258844502 0.0163017584 -5.75318045539274E-005 0.0276282311 0.0418928774 0.031131999 0.0213151284 0.0117591767 0.0046657483
Multiplier for best logarithm fit (using linear fit on logarithm) 1.0069625637 1.0108694208 1.0089693165 1.0068332117 1.003954279 0.9999561218 1.006588887 1.0106470664 1.0083893499 1.0059586687 1.0032032028 1.0012951305
R^2 for linear regression 0.7831995317 0.8841918579 0.8300249014 0.7055230676 0.5195390451 0.000020309 0.8033625099 0.9033206291 0.8426434174 0.69199366 0.4754694981 0.2096891884

Cohort mean age at birth

Cohort Mean age at birth (all birth orders), CMAB CMAB1 CMAB2 CMAB3 CMAB4 CMAB5+ CMAB40 CMAB40_1 CMAB40_2 CMAB40_3 CMAB40_4 CMAB40_5+
1953 27.92 26.03 28.57 31.12 33.08 34.97 27.82 25.96 28.49 30.99 32.64 33.88
1954 28.07 26.18 28.7 31.21 33.22 35.2 27.96 26.12 28.62 31.07 32.77 34.07
1955 28.22 26.35 28.84 31.3 33.34 35.31 28.1 26.28 28.76 31.16 32.88 34.2
1956 28.35 26.51 28.97 31.38 33.43 35.36 28.23 26.43 28.88 31.23 32.95 34.25
1957 28.47 26.67 29.09 31.45 33.5 35.47 28.35 26.58 29 31.29 33.03 34.34
1958 28.55 26.78 29.18 31.5 33.54 35.53 28.42 26.69 29.08 31.34 33.07 34.39
1959 28.64 26.89 29.27 31.55 33.61 35.55 28.49 26.79 29.15 31.38 33.11 34.42
1960 28.59 26.92 29.27 31.44 33.16 34.44
1961 28.7 27.06 29.4 31.49 33.21 34.53
1962 28.8 27.21 29.52 31.55 33.22 34.5
1963 28.92 27.37 29.66 31.64 33.23 34.49
1964 29.05 27.54 29.82 31.73 33.27 34.47
1965 29.15 27.68 29.94 31.77 33.29 34.47
1966 29.25 27.81 30.06 31.83 33.28 34.47
1967 29.36 27.94 30.18 31.93 33.29 34.45
1968 29.45 28.06 30.3 32.01 33.36 34.48
1969 29.55 28.17 30.4 32.09 33.42 34.52