Taste in a particular type of pop music doesn't fade with time IMO. What does fade with time is its presence in the mainstream. There are millions of people who favour 70s or 80s music who weren't even part of those generations. But for them to enjoy their music they don't rely on the mainstream channels (radio and tv etc.) but rather the more niche channels (dedicated night-clubs, classic radio stations, music cds etc.)
This, is the crux of the off topic discussion in this thread. I am like this too. I am only 28 years old, and most of my favorite music is by bands that broke up or were dead before I was born, or very shortly there after. Is this the norm for any generation? No. I am definately in the minority in my enjoyment of classical, folk, jazz, blues, and 60s & 70s rock, but it isn't such a minority that the music and performers will die and fade away within a generation. Much of my musical taste was cultivated by my dad's extensive collection of vinyl albums, just as my 2 year old son already loves to rock out to Jimi Hendrix and Metallica.
Oh an Lemon, sorry for my contribution to the hijacking of your thread