单项选择题

Which following is correct in terms of an aged society?

A. a group of 65-year-old and above account for 7 percent of the population
B. a group of 65-year-old and above account for 14 percent of the population
C. a group of 65-year-old and above account for 20 percent of the population
D. a group of 65-year-old and above account for 27 percent of the population
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