Testosterone. Men are more aggressive by nature. They stress themselves out and stress can lead to an early grave. Women are generally more able to relax. Men don't die earlier. Women die later.
Comes from the ancient times. Women were more important than men coz when a woman died ment the death of the child whilst a man lost could be afforded. They needed to live longer to take care of the prole.
The uneven playing field for boys starts early. The Y chromosome tends to develop mutations more often than X chromosomes and the lack of a second X chromosome in men means that X-linked abnormalities among boys are not ?masked? by a second, normal version. Survival in the womb is also less reliable for male fetuses (for uncertain, and probably multiple, reasons). Developmental disorders are also more common among boys; some of these could shorten life expectancy.
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