A lot of the big 90's songs continued to be played over the succeeding years. Garth, Randy, Alan, Clint, George Strait, Brooks & Dunn, Little Big Town, Keith Urban, Alabama, Tim Mcgraw, Little Texas, etc. did not have their big hits quashed instantly. So people who were just 20 by 2010 and are around 30 to 35 now know those songs.
Just go to a Garth Brooks show and look at the ages. And the ones in their 20's know all the words and jump up on the seats to scream! And you can't go to too many Garth concerts, either!