> The chemical analysis of bones has demonstrated conclusively that early humans were not constantly teetering on the brink of starvation. On the contrary, they ate well despite having at their disposal only a few stone and wooden implements. > These findings support a surprising thesis, one that reverses everything we used to believe about the deep history of humanity. It was not the hunter-gatherers who “suffered f…
On lifespans, expectation at birth was very different from expectation for a young adult. (The latter was still much less than now, yes.)
Similarly I think we need to know more about the distribution of good years and bad years -- when your numbers are limited by famine, which you can't really store up for, it's not strange for the good years to be relatively light on the day-to-day work needed. If this long article mentions this, I missed it in my skim.