从1980年的人口普查中可以看出，随着美国东北部和中西部的人口增长接近停滞，地区间的竞争越来越激烈。

Emerging from the 1980 census is the picture of a nation developing more and more regional competition, as population growth in the Northeast and Midwest reaches a near standstill.

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根据美国人口普查局的数据，2018年，65岁及以上的人口占比16%，较去年增长了3.2%。

The share of the population 65 and older was 16% in 2018, up 3.2% from the prior year, according to the U.S. Census Bureau.

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根据人口普查预测，女性预期寿命将从1981年的78.3岁增加到2005年的81.3岁。

According to the census projections, female life expectancy will increase from 78.3 years in 1981 to 81.3 in the year 2005.

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