The average life span for American men from 1920 to 2020 is given by M(t) = 45.1 + 18.8 ln(t), where 1 ≤ t ≤ 6 and M(t) is in years, and t is measured in twenty-year intervals with t = 1 corresponding to 1920. What is the approximate life expectancy for men in the year 2020 (t = 6)?
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