why the propotion of old people are rising原因?

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why the propotion of old people are rising原因?
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why the propotion of old people are rising原因?
why the propotion of old people are rising
原因?

why the propotion of old people are rising原因?
为什么老年人的数量还在增加

为什么老年人的比例还在增加?

为什么老年人的数量还在增加?

为什么老年人口的比例在增加?