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50 actually seemed about right for me excluding infants so I looked it up.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2625386/
That study looks at lifespan after reaching 5, and 50 might still be a little generous with the care that humans could provide each other 50,000 years ago. 50 is about the lifespan of a king 3,000 years ago, I can’t imagine gen pop faired better.
It’s also a sample size of 15 all “King’s of Judah” which is already urbanised.
But it’s good to see some decent data. It’s a nice irregular line from there on, and women do gain a lot more improvement than men.
I wish I had access to scholarly journals still to do my own research, but I don’t so I’ll defer to your stuff for now. Thanks.