That's true. We do have such age limits for the young.
However, in the case of younger people it means only that they will have to wait several years before possibly entering into a long career of public service, whereas with the upper age limit it's not only arbitrary (65? 70? 75? 80?), but it also means the
end of that person's service, whether or not he or she has been affected by dementia, etc.
Bringing the matter down to today's reality, the following announced candidates for the upcoming Presidential election would not be able to meet an age limit for holding that office if it were set at the presumably reasonable age of 70--
These are their ages at present, one and a half years prior to taking office if elected next November.
As you can see, the 2024 election would, under such restraints, be between Mike Pence, Nikki Haley, or Tim Scott (R) versus a player to be named later, probably Gavin Newsom of California (D).
- Joe Biden: 80
- Marianne Williamson: 71
- Robert F. Kennedy Jr: 69
- Donald Trump: 77
- Asa Hutchinson: 72
- Larry Elder: 71