Most cities still have a generic classic rock station. Typically 70’s Zeppelin, Stones, CCR, steve miller, journey,etc. Mostly the same songs that they called classic rock in the 90s, though its expanded to include 80s rock from bands that started in the 70s like Van Halen, ACDC, Aerosmith, and even 90s music like Black Crows, because their music sounds like classic rock. So its more about sound than a specific time period.
“Modern Rock” stations still play a lot of 25 year old music like nirvana, alice in chains, greenday, soundgarden, mixed in with contemporary releases like…all these bands of today who i dont know their names…because it all generally sounds like “modern rock”