The nation is poised to elect one of its oldest presidents, and while age doesn't determine health, it begs this question: How much do we know — and should we know — about how physically fit Donald Trump and Hillary Clinton are for the job?
At age 70 Trump would be months older than Ronald Reagan on his election day. Clinton will have just turned 69.
Increasing age affects the risk of various diseases, but people are living longer than ever, and researchers say it shouldn't' be a litmus test.
Each candidate had their own doctor write a letter last year attesting they're in excellent health. Clinton's letter was more detailed than Trump's.
Health habits play a big role in withstanding the relentless stress of the job.
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