@stuartk,
I forgot to mention, and you probably already know this, that Ken Burns also did a series on country music which I enjoyed. I believe that all music influences all other music. Musicians are people and listen to the world of music.
I pretty much listened to classical music until I went to college and then the "crowd" pulled me into other kinds of music. We were going to bars and the Fillmore and dancing, and you can't do that to classical music.
A woman at a party I went to last night mentioned Alban Berg, so I'm now listening to him because he's a classical composer I don't know much about.
You are right about Baby Boomers, but I think it's true of all groups. They stop learning about music after they settle into adulthood. I am constantly trying to find new things but it's difficult to adjust one's musical understanding.
My friend who goes to jazz concerts with me loves Billy Strings. I've tried him but wasn't drawn back. You seem to know a lot about bluegrass. A lot more than I do. I've just kind of picked a few cherries off the bush.