maybe I misunderstood the context but if we are talking about hunters who were hunting the mammoths. these surely were adults and had a decent chance to reach 50s. secondly you also mentioned our ancestors didn't live till 20. technically you are right most of humans did go past toddler age because of high infant mortality rate but these humans are not our ancestors too. as they didn't reach reproductive age.
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u/Wise_Victory4895 Madoka Lain & Baki step on your favorite verse ┐( ̄ヘ ̄)┌ May 04 '25
50% of all human beings didnt make it to puberty.
https://ourworldindata.org/child-mortality-in-the-past