In 1930, if a person starts paying into the pension at 30, at that point they have a life expectancy of 37 years, ie they will benefit from the pension for 2 years. Life expectancy at age 30 goes up to 48 in 2020, which gives them 13 years after retirement, 6.5 times higher. Assuming linearity, the average life expectancy after retirement during the time you are paying into your pension between 30 and 65 would be 7 years in 1930, and 17 in 2020.
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