What person, living or dead, met the most American presidents?

By the way, I think I recall trying to google the answer to this question a while ago but didn't find a clear cut answer, however I do know that two currently living American presidents might be in the running, Jimmy Carter and Bill Clinton, Carter due in part because he's the oldest living American president ever and has met a whole lot of other American presidents in that lifetime, and Bill Clinton due in part because he had a very early start in meeting fellow presidents (he met JFK when he was only 15 in 1963 while on a school trip, and even shook his hand.) plus all the other presidents he's met. Another person, now deceased, that's also probably in the running is the reverand Billy Graham, he met virtually every American president from 1948 til his death in 2018.

John Quincy Adams met all the early Presidents through his career in politics, from Washington through his death in 1848 during the Polk Administration, eleven administrations. Adams also served in Congress with six more men who would go on to become President after his death (everyone through Andrew Johnson). So if you count those, Adams met 17 US Presidents (if you include meeting himself). Adams' number would grow if you include Presidents under the Articles of Confederation. there were eight of them, and Adams almost certainly met most of them as a young man working for his father.

If you don't count presidents under the Articles, Adams' record was beaten by Alice Roosevelt Longworth, the daughter of Teddy Roosevelt. She met every President from Benjamin Harrison through Ronald Reagan, a total of 18 Presidents.

https://www.quora.com/What-person-living-or-dead-has-met-the-most-US-presidents

https://fee.org/articles/blind-but-not-disabled/

Fanny Crosby, the blind writer of thousands on Christian hymns met every president from John Quincy Adams through Wood row Wilson. That would be 21 presidents. It would appear that this is the most presidents met by one person.

Queen Elizabeth 2

Don't forget the large number of other 'American' presidents. Wiktionary says

American (plural Americans)

A citizen or inhabitant of the United States of America.

Roughly two-thirds of Americans default to the General American accent, with other dialects like Southern, AAVE, and Chicano usually being considered lower prestige outside of entertainment and politics.

(uncommon) Any inhabitant of the Americas.
(historical) A citizen or inhabitant of British North America.
(archaic) Synonym of American Indian or Native American, an indigenous inhabitant of the Americas. [from 16th c.]

(uncountable, US printing, rare, dated) A size of type smaller than German, 1-point type.

Usage notes
Within most English dialects, American now refers particularly to the people of the largest English-speaking country in the Americas, the United States. Other senses now typically require qualifiers: Central American, Native American, &c. Some speakers maintain separate idiolects, however, including some Native Americans. Many Latin Americans also pointedly maintain Spanish and Brazilian Portuguese's preference for using América to refer to the Americas generally.

https://en.wiktionary.org/wiki/American

This possibly applies also to the question about the 'American' on the French monument.