Going forward a little bit, I was such a snob of '30s and '40s movies (naw! really??), it took me a long time to admit to myself how much I love some of the later classics (and by later, I mean like '50s & '60s lol).
A lot of good movies came out of the '60s/early '70s: "Goodbye, Mr.Chips" (corny ol' thing! But I love Peter O'Toole lol), "Butch Cassidy and the Sundance Kid," "The Prime of Miss Jean Brodie" (OMG OMG MAGGIE SMITH!!lol) and "Bonnie and Clyde."
Some '50s classics as well, but they were a bit stilted in some way for my taste...like plays, maybe? But a few that stand out would be "A Place in the Sun" with the ever-gorgeous Elizabeth Taylor and Montgomery Clift, "Rebel Without a Cause" with James Dean and Natalie Wood, "On the Waterfront" with Marlon Brando, and a CLASSIC, "Some Like it Hot," with Jack Lemmon, Tony Curtis, and the wonderful Marilyn Monroe!!! 😉