I'm in that age group, and what WEBR plays is about 70% unfamiliar and about 100% unlikable. I had pretty similar taste to all my friends in Junior High and High School, and, although I also acquired a taste for jazz and r&b from my part time radio job, I never listened to old-line MOR. And nobody in my peer group did, either.
One has to be pre-Baby Boomer to like that music as a steady diet. That means they were mostly pre-WW II babies and pretty old now.
As I said, talk listeners don't pick arbitrarily between music and talk. It depends on the mood. Nobody, except a few religious format listeners, exclusively cumes only one station. The average person has a variety of stations they like, and they pick the one appropriate for the way they feel at the moment. In fact, Iheart has made quite a success in several markets with a "wall of women" as they find that they can capture female listeners in different moods with several formats... CHR, Hot AC, AC, etc., without them ever leaving a company station.
Not sure where you got the 70 percent unfamiliar and 100 percent unlikeable numbers. Some people may say that about CHR formats. It depends on who you ask.
Some 70 year olds may find Oldies Pop "too old" for their tastes. It depends on the individual...