Mrs. Clinton was hospitalized for a few days at the beginning of 2013 after sustaining a concussion, which led to a blood clot in a vein between her brain and her skull behind her right ear.
“There’s nothing to it,” Mr. Clinton said of Mr. Rove’s remarks, pronouncing himself “sort of dumbfounded” at the suggestion. He did acknowledge that Mrs. Clinton had suffered a “very serious concussion,” and that it had taken her months to fully recover.
The four times the Democrats have won since Reagan, their winners averaged 48.5. The three times the Democrats lost, their candidates averaged 57.
Obviously, these sample sizes are tiny. Still, these numbers ought to give the Democrats pause before blindly adopting for Hillary's benefit the GOP's strategy of nominating elder statesmen who have come close in the past like Dole, McCain, and Romney.
P.S. What's the maximum age to command a nuclear missile submarine? All I can find is the average age of the Old Man:
How old is the commanding officer of a submarine?
The average age of a Commanding Officer is 38-42.
That's a running joke in Heinlein's sci-fi novels for boys. The young ensigns on the starship all assume the Old Man is as old as the hills, but eventually you figure out that the venerable captain isn't quite 40.