Ageist as fuck.
Also…not sure how many people today know this but the longest ever serving president was confined to a wheelchair. Unassisted mobility isn’t a requirement to run this country.
To be fair, FDR was in no shape to be President at the end. But it's an interesting comparison, as he only ran for a 3rd and 4th term because he saw the existential threat of WWII and felt the US needed continuity of (his) leadership.
(screenshot from Wikipedia)
Reading that, though, it’s clear that he WAS still doing his job capably enough right to the end of his fourth (!) term. If he was ready to retire before attempting a fifth (!!) term, well, who wouldn’t be?
Four terms and a world war is a pretty dang good record.
Ah, ok, I was unclear on the timeline. Still a good run under the circumstances.
And none of it indicates that being “old” or being mobility impaired had any significant negative effect, it seems like the biggest issue was the kind of heart health issues that can and do affect people of all ages.