Once you agree on the premise, it’s only a matter of asking what the limit ought to be, and while there may be some theoretical value to that discussion, it seems the average voter in practice is at most ambivalent about candidate age, and I definitely don’t think it’s a given that were the limit ever changed, that the number would be lowered, rather than increased.
By way of example, people in the last decade seem to currently have a preference towards significantly older candidates. Biden took office as this nation’s oldest president at 78 [1], and Trump was our nation’s second oldest president at 70. [1]. Bernie Sanders, Clinton’s largest competitor for delegates in the 2016 primary, would have been 75 had he been nominated. [2]
America, for better or worse, seems to like old people.
[1] https://en.m.wikipedia.org/wiki/List_of_presidents_of_the_Un...
[2] September 8, 1941 birthdate; +75 gets to 2016