We now have a better idea of why women live longer than men, on average, thanks to the most comprehensive analysis yet of the differences in lifespan between male and female mammals and birds. The average global life expectancy is about 74 years for women and 68 years for men. There are various ideas to explain why women tend to live longer than men, including the suggestion that young men are more likely to die in accidents or conflicts, and that women are better protected against potentially harmful mutations in the sex-determining chromosomes than men, but the picture is far from complete.
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