It's amazing that all these elected officials of both parties are over 70. You can be really fit and sharp over 70, but no one is what they were at 50. When I pick a surgeon, I'm going with someone 40-55. Experienced, yet young enough to be up on all the latest shit.
You don't want the really young dude. You don't want the old dude. This rule holds true with all the truly important jobs. That we're still dealing with Trump, McCain, Pelosi, Bernie, Biden, Hillary as our go to crew is seriously problematic.
These are the people you keep on speed dial for when you run into some hairy shit and they'll give you a solid 2 hours of wisdom as long as you catch them before 3PM. Rare is the individual cut out for a high pressure demanding gig at that age.