Aging Populations
人口老龄化
What is making the world so much older?
是什么让全世界的人口日益老龄化？
There are two long-term causes and a temporary blip that will continue to show up in the figures for the next few decades.
这是由两个长期原因和一个暂时现象造成的，并且在未来的几十年里，这些因素还将继续存在下去。
The first of the big causes is that people e...