Forty years ago, the life expectancy of men at birth was only 68.6, and ten years later it increased to 77.1. Until 2012, the life expectancy of men at birth was 80. The life expectancy of men at the age of 20 was 70.5 40 years ago, that is, it increased by ten years compared with 2012. When I observed the life expectancy of different ages 40 years ago, I found that the life expectancy increased with age. However, compared with 2012 40 years ago, the life expectancy in 2012 was 80-.
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