The central challenge for China is to get rich before it gets old:
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The situation of a top heavy elderly population in China will be more acute that it is in Japan today.
Possibly a result of the one-child policy.
Japan and Germany managed to do become rich before becoming old and it's far from a panacea.
It's not clear yet if China will succeed.
Never criticize anyone until you've walked several kilometres in their shoes.
Because
1. You're now several kilometres away; and
2. You've got their shoes.