I was 14 in 1969, and the field was already narrowing for me.
Kids my age were all up into the Grand Funk Railroad crap and anything else that was loud, simple, and (often) stupid. So Fall of 1970 (after a summer of Zappa) , I got introduced to a rather narrow range of jazz. Even though it was a narrow range, it was infinitely more interesting (in many ways) than the stuff everybody was getting in to. So I flipped the switch more or less right away. There were some interesting rock/pop things still, but mostly R&B and some other stuff that had jazz inflections and or implications. That switch flipped pretty hard.
I got so alienated from the rock/pop musics that from 1972-1973, the only radio I listened to was this FM "Easy Listening" station, because they played a lot of records of standards, multiple versions in multiple styles, and as my jazz awareness grew, so did my awareness of standards. so...that worked. And once in a while they would play some unobtrusive jazz. That was where I heard Lenny Breau! "King of the Road"!