alternatehistory.com

Maximum, as opposed to minimum, ages for heads of state are rare, but apparently they do exist. One source states that "We find only one country, Benin, where there is a maximum age of eligibility, set at 70 years for presidential candidates..." https://books.google.com/books?id=IHA8h0QrAZwC&pg=PA55

However, Russia also used to have one: "There is no upper age limit, as there was when the presidency was introduced in 1991. Then there was no residency requirement but a maximum age of 65. Boris Yel'tsin, the first Russian President, was born in 1931, and would have already reached 65 at the latest date for his possible re-election, which was July 1996. No surprise, then, that the upper age limit was eliminated with the reorganisation of the conditions for candidacy for the presidency under the 1993 Constitution..." https://books.google.com/books?id=GIB6BAAAQBAJ&pg=PT85

Challenge: Get such a maximum age limit in the US Constitution.

(This could go in either the pre-1900 or post-1900 section, depending on whether the maximum is found in the original Constitution, a pre-1900 amendment, or a post-1900 amendment. The most likely POD for an amendment is a bad experience with an elderly president who is seen to have been in his dotage. No, I don't mean Reagan, and in any event the 25th Amendment at least in theory provides a way to deal with a senile president.)
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