I could just imagine it getting corrupted.
And, BTW,
when is the last time a president died of natural causes in office
? Reagan came closest with Alzheimers, albeit his handlers kept the progression quiet until he was out of office. Who was steering the ship on his bad days?
We are a risk taking country. We run our country on the back of people who take risks. It's not surprising we don't worry about candidate's heath when we see ourselves as invincible.
If we had a crystal ball, a problem we should address is that every one has a "flame-out" stage. For some it's in the 60's others in the 90's. It's not the energy we see on television that counts, it's the energy you have when you roll up your sleeves and get to work that counts.
It's much easier to see a person from the private sector as a super energized person because they have to be one to survive. People in the top tiers of government are invisible and you only see what their handlers let you see.