We still know almost next to nothing on trumps health.

[Stellar]

3. How about his mental stability? Ronald Reagan comes to mind.

Because Mr. Trump and Mrs. Clinton are in the age range of increased risk for Alzheimer’s disease and other forms of dementia, many experts have urged that they take neuro-cognitive tests and mental status tests that can detect early clues to dementia. Neither Mr. Trump nor Mrs. Clinton has said whether they have taken such tests.

Mr. Trump has said he was “blessed with great genes — both of my parents had very long and productive lives.” Dr. Bornstein wrote that Mr. Trump’s father, Fred Trump, lived into his 90s and his mother into her late 80s. But Dr. Bornstein did not mention that Fred Trump developed Alzheimer’s disease beginning in his late 80s. The genetics of most forms of Alzheimer’s and dementia are not known with certainty. Doctors consider it prudent to be aware of such a risk, and for patients to be checked if specific signs become apparent.

NewYorkTimes