Quote:
Originally Posted by xoxoxoBruce
The US life expectancy for men is 76.4 years.
Half of 76.4 is 38.2 years
A third of 76.4 is 25.47 years
So middle age is 38.2 plus or minus 12.74 years
Young ===== Birth to 25.46 years
Middle Age = 25.46 to 50.94 years.
Old ======= 50.94 to 76.4 years
Questions? 
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Should we include childhood in this? Or are we looking at three ages of adulthood?
In which case young would be 18-37
middle-aged would be 38-57
old-aged would be 58-77
...or thereabouts.....