Quote:
Originally Posted by BWillie
How old are old people? How old is middle aged? When does young adult and later adulthood start?
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77.28 years old is the male life expectancy in the United States
< 25% would be youth
25% would make 19.32 start of prime
50% would make 38.64 middle age
75% would make 57.96 moving into old age
> 77.28 would be old