Across the globe, the longevity of people is steadily lengthening. Female life expectancy, which exceeds that of males by a narrowing margin, has climbed by approximately three months per year for the last 160 years. In 1840 in Sweden, for instance, the leading country for enjoying a long life at the time, life expectancy was about 45 years; in 2014 in Japan, a current leader in producing centenarians, it was 84, almost four decades longer.
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