If we were talking a race between Clinton and a younger candidate like 45 yo Rubio this might be more of an item. But Trump is 70. I know more people that I worked with that died in their 60s than I can count. He's usually wearing a suit which makes it less noticeable, but if you see pictures of Trump golfing he's definitely a bit overweight. Who's to say he couldn't have a heart attack 1 week into office? She's 68 and was travelling the world as Sec of State, and now is zipping around the country doing nonstop speeches. So imo health is a wash between the two. Trump's doctor is really strange and so his bill of good health didn't hold much water. And as far as vice-presidents if something happens to either of them, Kaine is far more mainstream and rational than Pence.