Damn, dude, in my area shit from the 90s and early 2000s has been played on Classic rock stations for at least 10 or 15 years. They still play the older stuff too but it's heavily mixed with jams from the 90s and early 2000s. My Mom complains all the time that they play "my music" too much on the Classic rock stations these days.

I want to say I was in my mid 20s when they started playing Nirvana, Alice in Chains, Soundgarden, Stone Temple Pilots, Pearl Jam, Foo Fighters, etc. on there (which would mean they've been playing it closer to 20 years). I've heard Breaking Benjamin, the White Stripes, and Fall Out Boy on there, too, though they were added more recently.

The first time I heard a song from the 90s on a classic rock station, I was like, "Yay!" 😁 and then immediately like, "Aww." 😔 Yay because these are my jams, Aww because it made me feel old. But at this point I've just accepted "my" music is, in fact, old enough to be played as classic rock.