I don't know why.. may be it's just a purely generational thing (ie. the music you grew up with type thing).. but I was born in 1976 and I prefer music from the 60's and 70's and some of the 80's stuff.. the further into the century things got the less I liked the current music.

May be it's just simply information overload.. so by the time you're 20 you just don't have enough room for the new stuff.. but I think at the ultimate level of truth, the answer would be that both old and new music are better.

Or.. may be you just simply "like" that kinda music.. and that's just the way it is.