...and what on his health record scares you so much? Nothing. There is no medical reason that he should have any problem completing his presidency. Next.
actually, he seems to be in the early stages of dementia to me. he does not seem that sharp to me, and it seems to be getting worse.
of course, Reagan showed that you could have dementia and still run a country (and be canonized by your party as well!), so perhaps there is no worry.