Mrfunkedude, 
So I have this hypothesis that people who never listen to music past their teenage years do so because of a traumatic event in their childhood.
Music became a comfort to them during this time which switched it from being just enjoyable, to being enjoyable plus emotionally comforting.
Hence the desire not to listen to music outside of that comfort zone because any music past that, is no longer comforting and no longer serves a need.
Or not. I don't know. It's just a thought.