Is your memory improving? How about your energy and stamina and strength? That's getting a lot better as you get older? What about your vision and hearing and balance? Better than ever or is age taking its toll? Do you sleep long and well at night or do you keep waking up? Do you take naps during the day not intentionally but because your body orders you to do so?
However well-intentioned and BRILLIANT the old are they cannot turn back the clock on any level for any length of time.
I don't know why anyone would want to be president at any age. It is a thankless job for good people to take on. For those who aren't good it's a great job since there are no boundaries no limits no blocks no tackles. .
How old are you and if offered the job would you take it on?
Being old isn't a useful thing to be. How many things that are very old do you go out of your way to buy? 100 year old wine? 1000 year old artifact?