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					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?   | 
	
 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.....