| http://www.w3.org/ns/prov#value | - Life expectancy is the same thing as average life span, and it does not tell you anything about the number of elderly people in a given population.Hunter-gatherers had higher rates of infant mortality than we do today, lived higher risk lives (the lion was just one example), and did not have modern medicine (which combats diseases caused by agriculture as well as other kinds of problems).
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