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by phonypc 2140 days ago
I'm half-remembering things from an article I probably read years ago. Upon a quick search, this looks like a decent source maybe?

http://www.unm.edu/~hkaplan/KaplanHillLancasterHurtado_2000_...

As another poster pointed out, we can't really know how long people lived in prehistory. The numbers come from contemporary hunter-gatherers.