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──据美国人口调查局统计：２０００年美国６５岁及以上的老年人口占总人口的１３％；而这一比例在１９８５年时是１２％；在１９７６年时是１１％。１９８０年时美国人的平均年龄为３０岁；１９８５年为３２岁；１９９０年为３４岁，而２０００年则上升为３７岁。人口老龄化?
According to the Census Bureau, the United States accounted for 13% of the total population of the population aged 65 and over in 2000, compared with 12% in 1985 and 11% in 1976. The average age of Americans in 1980 was 30; in 1985 they were 32; in 1990 they were 34 and in 2000 they were 37. Aging population?