Why do women live longer than men?

As of 2024, while the average life expectancy in the U.S. climbed to 79, there was a striking and persistent gap between men and women. Women lived an average of 81.4 years, men 76.5. This five-year difference has been consistent over recent decades.

Why do women live so much longer than men?

Some of the difference is biologic and not anything men can change. Women have two X chromosomes, men one. This means that women have “backup” for loss of X chromosome gene deletions or losses. There is some animal data suggesting that the male Y chromosome has deleterious effects.

Women have stronger immune responses, letting them better fight off infections (but also making them more prone to auto-immune diseases like lupus).

Women have much more circulating estrogen than men, which seems to delay the onset of coronary disease, though women “catch up” after menopause when their estrogen levels drop.

There are many factors over which men do have control. Men are more likely than women to smoke and drink heavily, both negative factors for longevity.

Men are more likely to work in hazardous occupations (construction, fishing , forestry, police and fire, etc.) than women. Men also engage in more risky behaviors such as speeding in cars, fighting and extreme sports.

Women are much better than men at looking after their health – getting regular checkups, seeing a doctor if something seems wrong. Men tend to avoid doctors until forced to.

Women generally have much better social networks, a consistent factor promoting longevity. Men’s friendships tend to be less intense and less personal.

So, while we cannot (yet) engraft a second X chromosome into men, there are a lot of things men can do to emulate women and hopefully add a few years to their lives.


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