I recall on one critical senate vote running late into the evening, Strom Thurmond, who was like 123 at the time, was tired and a Rodent senator volunteered to "pair" with him so the net result of the vote would not be changed, so Thurmond could go home and rest.
The Klansman Senator, the hate-filled racist Democrat Byrd, refused permission for that pairing and Thurmond was forced to remain....solely to feed the spite of the Rodents.
I'd be perfectly comfortable with a Constitutional Amendment that prevented anyone who would reach their 75th birthday during the term of office from being on the ballot, for House, Senate, White House or what should be term-limited Federal judge appointments.
If nothing else, that generation is fading and will no longer serve the interests of the majority of the American people. Certainly the Klan Byrd served was out of date.
Pilots are grounded when they reach 60.