For me age is irrelevant if they can do the job but it’s abundantly clear neither Trump nor Biden are capable. The reason I think age doesn’t matter is because someone like Bernie Sanders has been rock solid on his positions for decades and can still form convincing arguments. I’m sure we’d all love a younger candidate and I’d have settled for Andrew Yang but the radical idea of a universal basic income ensured the DNC pulled him off stage.
The two party system has essentially guaranteed we will always be voting for the least damaging candidate and until we transition to ranked choice or abolish the DNC/RNC we’re just stuck right where we are.