>If
>adulthood begins young, like between 14 and 16, and life expectancy
>is between 30 and say 50, probably the bulk of combat troops are
>going to be young adults;
Those kind of life expectancy figures are life expectancy _at birth_ and include the high rates of infant mortality. To illustrate how they work: if a village has a life expectancy of 40 years and 50% of the newborns die before their first year - the remainder of villagers will live to an average of _80_ years.
--Peter Metcalfe
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