According to a new study, American presidents tend to outlive other American men.

While the presidency seems to turn guys gray in a hurry, researchers found that most presidents have actually lived longer than other American men their age.

And, all living presidents have either already surpassed the average expected life span or are likely to do so.

For example, the first eight presidents lived on average 79.8 years at a time when life expectancy for men in the United States was under 40.

And, some presidents lived a long, long time. Gerald Ford was 93 when he died, Reagan was 93, while John Adams and Herbert Hoover lived to be 90.