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Fig. 1. Female life expectancy at birth (e0) from 1840 to 2050. The thick gray line shows the trend in female life expectancy in the national population with the highest life expectancy. The thin black line shows the trend in female life expectancy in the United States. The broken gray line extrapolates the long-term trend in best-practice life expectancy. The dashed black line shows the Social Security Administration's "intermediate" forecast.

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Science of Aging Knowledge Environment. ISSN 1539-6150