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[–] chintappingretard ago 

You are wrong :

Wikipedia has this exact sentence : "Based on Early Neolithic data, total life expectancy at 15 would be 28–33 years"

https://en.wikipedia.org/wiki/Life_expectancy

So if you lived to age 15, then 50% of the time you would die before age 33.

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[–] xenoPsychologist ago 

The following information is derived from the 1961 Encyclopædia Britannica and other sources, some with questionable accuracy.

you didnt forget something, did you?