If we are running someone that old, can we please run Dumbledore? Fought against evil his entire adult life, took steps to make education available to all witches and wizards equally regardless of if you were pure blood or muggleborn, taught forgiveness and understood that people could change, for better and for worse. Also taught his students well enough to fend off a full-scale attack from a hoard of adult casters, giants, and a fucking lich without needing his intervention.

(yes, I am talking about Bernie... The only old fuck that is still worthy of holding office)