The stress level has to be off the charts and is way to hard for an old man to with stand. Someone that is in excellent mental and physical shape at 60 would be acceptable I think. That's why I can't understand why dems are putting the election at risk by only offering Biden and Bernie as their front runners. Warren is very qualified but I don't think she can win against trump, not enough voters will vote a woman in I am afraid. I pray I'm wrong because she's our only real hope. I like Bernie but he is old as dirt and I would hate to have him keel over on innoguration day. Get out and vote for our lives.