参考译文

　　The number of people aged 60 and above in China is expected to jump from the current 185 million to 487 million, or 35 percent of the population, by 2053，according to figures from the China National Committee On Aging. The expanding ratio is due both an increase in life expectancy and by family planning policies that limit most urban families to a single child. Rapid aging poses serious threats to the country’s social and economic stability.