In terms of newborns, the number of boy babies is larger than girl babies, and the gender (sex) ratio is 105 (boys:girls=105:100). The death rate of men is bigger than women's. So around age 50, the sex ratio becomes 100. Over 50, the women's population is bigger than men's.
Figure : Gender Ratio by Age in Japan in 2013
Age | Gerder (sex) ratio |
Total | 94.7 |
0 | 105.1 |
1 | 105.0 |
2 | 105.6 |
3 | 104.9 |
4 | 104.7 |
5 | 104.7 |
6 | 104.9 |
7 | 104.8 |
8 | 104.9 |
9 | 104.6 |
10 | 105.2 |
11 | 104.9 |
12 | 105.1 |
13 | 105.5 |
14 | 104.9 |
15 | 104.8 |
16 | 104.7 |
17 | 105.1 |
18 | 105.2 |
19 | 105.5 |
20 | 105.3 |
21 | 105.5 |
22 | 105.4 |
23 | 105.4 |
24 | 104.9 |
25 | 105.0 |
26 | 104.4 |
27 | 104.5 |
28 | 103.6 |
29 | 103.5 |
30 | 103.3 |
31 | 102.7 |
32 | 102.9 |
33 | 102.8 |
34 | 102.9 |
35 | 102.7 |
36 | 102.7 |
37 | 102.9 |
38 | 102.9 |
39 | 102.9 |
40 | 102.4 |
41 | 102.8 |
42 | 102.3 |
43 | 102.3 |
44 | 101.6 |
45 | 101.4 |
46 | 101.5 |
47 | 100.9 |
48 | 100.9 |
49 | 101.2 |
50 | 100.6 |
51 | 100.4 |
52 | 100.3 |
53 | 100.0 |
54 | 99.6 |
55 | 99.0 |
56 | 98.9 |
57 | 98.7 |
58 | 98.6 |
59 | 98.1 |
60 | 97.2 |
61 | 96.7 |
62 | 96.4 |
63 | 95.9 |
64 | 95.3 |
65 | 94.6 |
66 | 94.3 |
67 | 92.7 |
68 | 90.7 |
69 | 89.7 |
70 | 89.0 |
71 | 88.2 |
72 | 87.3 |
73 | 85.9 |
74 | 84.5 |
75 | 82.5 |
76 | 80.8 |
77 | 78.8 |
78 | 76.3 |
79 | 73.7 |
80 | 70.8 |
81 | 68.6 |
82 | 65.6 |
83 | 62.6 |
84 | 59.1 |
85 | 56.4 |
86 | 53.2 |
87 | 49.2 |
88 | 44.6 |
89 | 40.2 |
90 | 34.6 |
91 | 31.3 |
92 | 28.9 |
93 | 27.1 |
94 | 25.7 |
95 | 24.0 |
96 | 22.7 |
97 | 21.1 |
98 | 19.6 |
99 | 19.1 |
100 | 15.1 |
Source is Statistics Bureau.
www.stat.go.jp/data/jinsui/2013np/
www.stat.go.jp/data/jinsui/2013np/zuhyou/05k25-2.xls
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