Why do women live longer than men?

From an article in Time Magazine:

One important reason is the big delay — and advantage — women have over men in terms of cardiovascular disease, like heart attack and stroke. Women develop these problems usually in their 70s and 80s, about 10 years later than men, who develop them in their 50s and 60s.

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Another more complicated possibility [for women's longevity] is that women have two X chromosomes, while men have one. (Men have an X and a Y.) When cells go through aging and damage, they have a choice in terms of genes — either on one X chromosome or the other. Consider it this way: you have a population of cells, all aging together. In some cells, the genes on one X chromosome are active; in other cells, by chance, the same set of genes, with different variations, are active on the other X chromosome.

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But, in general, there are maybe three things men do worse than women. They smoke a lot more. (That gender gap is fortunately shrinking, since men are smoking less and less.) They eat more food that leads to high cholesterol. And, perhaps related to that, men tend not to deal with their stress as well as women. They may be more prone to internalizing that stress rather than letting go — though that's a fairly controversial point. Nonetheless, stress plays a very important role in cardiovascular disease.