I realize this analysis is about "popular" music, so this may not entirely fit. But last year I listened to one of those Great Courses sets on "How to Listen to and Understand Great Music" and really changed what I've been listening to, which now includes quite a bit of concert music (baroque, classical, etc.) that I never really appreciated before. Am I an outlier that I'm picking up something new just as I turn 40, or does this not count because it's not pop music, and old fogies are supposed to drift into listening to this ancient stuff anyway?
I'd say I've also picked up a lot of new material recently because of Pandora, but I'll admit most of that is older music, where it's a genre/style I liked, but I somehow missed some of the artists from that era who are similar to ones I already liked.