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Just to point out that according to: http://en.wikipedia.org/wiki/List_of_countries_by_life_expec...

the life expectancy at birth for China in 2011 was 73.47 years (CIA World Factbook (2011 estimates)) compared with 78.37 for the U.S and 80.05 for the UK.

So one reason that all those old Chinese people may appear so mobile is that they aren't quite as old as you might expect.




There are a lot of killers between birth and elderly. Look at life expectancy at 65.




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