Where do you get that average life expectancy of 10-12? I never heard a figure that low, and I doubt humanity would have lasted that long if the average life expectancy was barely enough to reach sexual maturity. Also, I think these life expectancy in the past stats mostly do not distinguish between the extremely high death rate for infants, and the more normal life expectancy for those that survived past 2 y.o. The distribution is so skewed, I guess even the median expectancy would not be really useful.
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