Comment by inglor_cz

Medieval burial grounds, when examined by anthropologists, do contain some people over 60, but the majority of adults buried there died earlier, typically in the 45-55 bracket.

It wasn't just disease, but also wars and famines. And in women, deaths during childbirth, which cluster in the 20-35 bracket.

Cardinals of the Church, who led peaceful lives, didn't give birth and never went hungry, lived into their late 60s and early 70s even during the Middle Ages. But an average peasant wouldn't.