Yep. I was in school back in the ‘70s and there was a huge divide between the older and younger teachers.
For example, the younger teachers all had problems with spelling, including young English teachers. However, the older teachers, including in math and science, were uniformly competent spellers.
Those who had completed college by the ‘60s were unquestionably better educated.
Same in my experience; I had few teachers in the late seventies and early eighties who were under thirty, and they were the ones who, when asked about the subject matter, would say “I’ll get back to you on that” (and wouldn’t).