I went to public school in the 80s and every classroom had a very large analog clock on the wall. Even back then, it mildly annoyed me when teachers and other adults would say "half past" and so on. It always sounded archaic to my ears, even 40+ years ago.
I also get annoyed when people say "two thousand and twenty-four" for the year. Just say "twenty twenty-four". We didn't say "one thousand nine-hundred and eighty-four" back in the day, we said "nineteen eighty-four".
I was taught in the '80s that you shouldn't use 'and' in a number that isn't followed by a decimal portion (e.g. 23 and 4 hundredths). I've seen various back-and-forth on that topic over the years.