从上个世纪七十年代起，中国的出生率显著下降，需要抚养的孩子数量随之急剧减少，同时老年人口增长却十分缓慢。
Since the 1970s China's birth rate, and therefore the number of dependent children, has been plummeting, whereas the number of elderly people has been rising only gradually.
老年人口的抚养问题将成为最为棘手的社会问题。
The problem of foster aged people will become the toughest social problem.
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