You know, when I was in high school

I never knew about dual enrollment. I didn’t find out about such a thing until I was taking courses at a community college in my 40’s, and one of my classmates was a high school student doing dual enrollment. Is this a relatively new thing, or was there just a lack of information in the late 70’s?
Heck, I didn’t even know about *community* college when I graduated from high school. Even though my high school is highly rated, there was no education guidance that I can remember.