不过可以看一下汉民族的：
汉族各年龄段比例相比总计比例增减
总 计(10年普查） 0.91599232
0-4岁0.886224811 -3.2497553335%
0 0.879661122 -3.9663212512%
1 0.886807505 -3.1861419353%
2 0.886951296 -3.1704440224%
3 0.887749729 -3.0832781837%
4 0.889297342 -2.9143233876%
5-9岁0.885270199 -3.3539714425%
5 0.88925775 -2.9186456582%
6 0.886439974 -3.2262657088%
7 0.881435184 -3.7726447057%
8 0.88397292 -3.4955970150%
9 0.884790711 -3.4063177708%
10-14岁0.888018673-3.0539172291%
100.884459129-3.4425169808%
110.885071622-3.3756503042%
120.886617143-3.2069239675%
130.889484239-2.8939195841%
140.893793869-2.4234319651%
15-19岁0.907437671-0.9339214385%
150.900330573-1.7098120886%
160.903355474-1.3795799331%
170.908435128-0.8250278596%
180.908493138-0.8186948873%
190.914965679-0.1120796334%
20-24岁0.9162234120.0252286199%
200.9189868080.3269119343%
210.9186039250.2851120823%
220.915248969-0.0811525131%
230.9164825360.0535174664%
240.910773966-0.5696940573%
25-29岁0.90768078-0.9073809409%
250.904669197-1.2361591230%
260.90615047-1.0744467904%
270.907604889-0.9156660562%
280.910218493-0.6303357561%
290.909470657-0.7119779192%
30-34岁0.908306158-0.8391076462%
300.901863705-1.5424381259%
310.91082361-0.5642743445%
320.908249368-0.8453075360%
330.910504251-0.5991391921%
340.909904982-0.6645621752%
35-39岁0.9185979250.2844570496%
350.910514829-0.5979843423%
360.913568004-0.2646655187%
370.9194327120.3755917836%
380.9213996420.5903239884%
390.9264180121.1381855144%
40-44岁0.9255136931.0394599716%
400.9242016860.8962265450%
410.9258025341.0709930339%
420.925941261.0861379269%
430.9252560011.0113274037%
440.9264582971.1425834531%
45-49岁0.9287116641.3885862893%
450.9253861461.0255354461%
460.9258279471.0737674274%
470.9328030381.8352466477%
480.9299933191.5285061663%
490.9296874331.4951122321%
50-54岁0.9321593921.7649789952%
500.9263899121.1351178109%
510.9312814441.6691323005%
520.9306685421.6022210347%
530.9361086382.1961229851%
540.9348245892.0559417487%
55-59岁0.9363521892.2227117287%
550.9354778012.1272537050%
560.9347906352.0522349901%
570.9356816082.1495035939%
580.9374006562.3371741796%
590.9390480132.5170181888%
60-64岁0.9331156331.8693730267%
600.9319211261.7389671551%
610.9320660441.7547881139%
620.9339842421.9642000812%
630.9342845521.9969852758%
640.9338725641.9520080393%
65-69岁0.9292762371.4502214726%
650.9316969111.7144893649%
660.9290426471.4247201820%
670.9265228361.1496292464%
680.9275139431.2578296392%
690.9312934061.6704382783%
70-74岁0.9315626041.6998268857%
700.9271927181.2227611754%
710.9299066761.5190472678%
720.9312271111.6632007013%
730.9337044951.9336597556%
740.9367254852.2634648981%
75-79岁0.9389934642.5110630245%
750.9376256662.3617388304%
760.9384956042.4567110238%
770.9405479672.6807700062%
780.939698812.5880664778%
790.9388259512.4927753730%
80-84岁0.9416371462.7996769876%
800.9373032482.3265400517%
810.9426526072.9105361021%
820.9425980032.9045749302%
830.9430911282.9584099627%
840.9457123443.2445712616%
85-89岁0.9452533843.1944660774%
850.9466332153.3451039453%
860.9460763353.2843085985%
870.9444153443.1029762365%
880.9452705213.1963369779%
890.9417554982.8125976374%
90-94岁0.9410976452.7407789308%
900.9374779932.3456171739%
910.9447745633.1421925941%
920.9418442972.8222919019%
930.9440683073.0650897619%
940.9398425122.6037545430%
95-99岁0.9314177291.6840107488%
950.9343527172.0044269531%
960.9343154842.0003621575%
970.9299469761.5234468221%
980.9251403390.9987004062%
990.92712721.2156084946%
100岁及以上0.910252129-0.6266636695%
可以看出80岁以上的汉族比例在94%以上，50岁以上在93%以上，15岁以上的在90%以上，15岁以下年龄越小的比例越低，而且下降得很快越来越快，0岁（10年时）的已经降到了88%以下。。。
对于一个10亿人口的大族而说，6个百分点不用我来科普有多少了吧？