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Largest-Ever Lifespan Study Of 1,176 Species Finds Females Outlive Males In 72% Of Mammals By ~13%, While In 68% Birds, Males Outlive Females By ~5%. Why? Male Competition For Mates Cuts Lifespan; Caregiving Boosts Female Survival. Matching Sex Chromosomes (XX/ZZ) Help Guard Against Mutations. Even In Zoos, The Gap Remains—It’s Biological.

Scientists Finally Reveal Why Women Live Longer Than Men – Newsweek

https://www.newsweek.com/scientists-finally-reveal-why-women-live-longer-than-men-10817820

The surprising reasons behind this biological phenomenon have been revealed thanks to the largest study of its kind to date.