Bill Clinton, George W. Bush and Donald Trump were all born in 1946. Judging from
https://en.wikipedia.org/…/List_of_Presidents_of_the_United… this is the first time we have had three presidents of the United States all born in the same year.
AHC: Get three presidents of the United States born in one particular year *other than* 1946. To get the ball rolling: Jimmy Carter and GHW Bush were both born in 1924, so we just need one more POTUS born that year. The possibility that first occurred to me was Frank Church.
https://en.wikipedia.org/wiki/Frank_Church Unfortunately, though, the year Church had the best chance of being elected POTUS was 1976--so if he were elected, presumably Carter would not be, and there would therefore still be only two presidents born in 1924. Unless of course, a Carter-Church ticket wins in 1976 (and there was talk about such a ticket--"Speculation about Frank Church, for example, focused on Carter's weakness in the West, where he entered five, and lost five, primaries"
https://newrepublic.com/article/91197/carter-convention-1976) and something happens to Carter in office...
(But maybe "Carter-Church" sounds a little too pious

)
Anyway, see if you can think of any other possibility, either after 1900 or before it.