But I'm constantly discovering new music even as I approach my late 50s. As you point out, you'll never find it on terrestrial radio, which are basically the same 300 songs over and over again with about 32 minutes of chit-chat and commercials every hour.
There are many ways to find new music such as Pandora and other similar apps that take songs and bands you already like and feed you newer songs based on them. But for me, Sirius/XM is the best as it's commercial free and focused on the music in every conceivable genre. I have about 30 of those stations in my favorites. Best ones for discovery are Spectrum, Outlaw Country, Garage Band, Loft, and Deep Tracks. But even the ones that you would think are limited, like First Wave, Yacht Rock, 80s, Classic Rewind, etc., go pretty deep and I'm always discovering new music from the period of my youth that I somehow missed while growing up.
Daytime radio is the worst now, because the key to ratings success is to make sure that nobody is actually listening. Most of the audience is in the workplace and employers don’t like distractions, so the playlists are carefully curated to be dull (think Muzak). The top-rated station here in Toronto has a classical format, but during the workday it’s awful- primarily movie themes and popera. Their programming after 8pm and overnight is fantastic, though.