Trump is 69. Clinton is 68.

And the President literally has some of the best health teams and doctors on the face of the planet, so comparing them to the average person is a bit of a diminished point. On top of that, Sanders is obviously in good health as of right now anyways. Do people suddenly drop dead? They sure do. At literally any age, but sure, especially in older age, of which Trump and Clinton are both in as well.

But the average life expectancy isn't as important as the leading causes of deaths. In this exact order;

Heart disease Cancer (malignant neoplasms) Chronic lower respiratory disease Accidents (unintentional injuries) Stroke (cerebrovascular diseases) Alzheimer's disease Diabetes (diabetes mellitus) Influenza and pneumonia Kidney disease (nephritis, nephrotic syndrome, and nephrosis) Suicide (intentional self-harm).

All of the major candidates are in the age group (60+) that run high risk in regards to Heart Disease, Cancer, Respiratory Disease, Accidents, Stroke, Alzheimer's, Diabetes, Influenza and Pneumonia, Kidney Disease and... well, that's literally all of them, except suicide of course, which I don't think we really have to worry about with someone like Sanders.

And if you want to look at 'average' statistics, then look at weight as well, which plays a very large role in health. What about people in overall good health? What is their typical life expectancy?

Regardless, this is a meek argument. All of the major candidates are in old age and their current and lifetime state of health makes a difference. I wouldn't be surprised to see Sanders live beyond Trump, for example. And a President isn't an average person with average access to healthcare.

TL:DR - Average life expectancy applies to average people. Is Sanders an average male american? With average access to healthcare? Currently, no. As President, more significantly no. It would be more fair to compare him to people in good health, who seem to live well into their 80's or even 90's. Take Jimmy Carter for example. 91 years old and just successfully received the literal bleeding edge in (Melanoma) cancer treatment. And that's a past president. Asking 'what if' is a silly way to go about things. What if he dies? How about what if he lives? Which seems more likely given the current state of everything. I guess that requires actual thinking, though.