Life expectancy at birth is a worthless statistic to compare to when looking at modern humans. Infant mortality was so high that it distorts the numbers. A more useful statistic is the modal age of adult death, which peaks between 65 and 75 across most estimates, regardless of era:
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1728-4457....
https://www.discovermagazine.com/health/when-did-humans-star...