I always assumed this was in part related to socio-economic reasons (men on average do jobs with much higher death rates) as well as the effects of pregnancy, w

I always assumed this was in part related to socio-economic reasons (men on average do jobs with much higher death rates) as well as the effects of pregnancy, where the mothers body can be healed when pregnant due to migration of stem cells. Wild speculation on that last one impacting the life span, but there is evidence for it. https://www.newscientist.com/article/dn21185-fetus-donates-stem-cells-to-heal-mothers-heart/ https://www.newscientist.com/article/dn21185-fetus-donates-s...