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life expectancy 1950 vs 2020
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life expectancy over the past 50 years
life expectancy 1950 vs 2020, life expectancy since 1950, average life expectancy 1950, average life expectancy 2020, life expectancy 1950 usa, life expectancy in 2020, how has life expectancy changed since 1950, life expectancy chart 2020, life expectancy over the past 50 years
