原因是显而易见的：美国的人口老龄化意味着更多工作机会。
许多国家人口迅速老龄化也是一个促进因素。
A rapidly ageing population in many countries is also a contributing factor.
多数富裕国家拥有快速老龄化的人口。
当然，也会有更多的老龄化人口。
从2015年起，中国人口将开始趋向老龄化。
人口变化是劳动力老龄化的又一原因。
Demographic change is another reason why the workforce is greying.
但是到目前为止，我们最严重的社会问题是人口下降问题和老龄化的问题。
But by far our most serious problem is a declining and aging population.
日本老龄化速度很快：年纪超过65岁的人已达人口的20%。
Japan is greying fast: already a fifth of its people are over 65.
你难道(只看到中国人口众多)不把中国老龄化的问题考虑进去么？
Did you take into account that China's population is also aging?
我国人口快速老龄化的趋势，将对我国的医疗保障带来诸多影响。
The trends of population aging in China will have much effect on health security.
我国人口快速老龄化的趋势，将对我国的医疗保障带来诸多影响。
The trends of population aging in China will have much effect on health security.
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