The New York & Boston folk clubs which I belong to, have a saying "So much music, So little time". There's so much music we want to discover, explore, learn, & hear over & over again. But I think I know what you mean. When you're young, all music is a new style, a new type of expression. As you've heard more music, more of it seems to be variations on themes you've heard before. So there may be a smaller percentage of music that you hear, that excites you in a significantly different way than music you already know. And with all the media, we're exposed to enormous amounts of talent. So I think it's just that you may have to wade through more music to find stuff that really excites you.

I agree with whoever said you can go through personal phases, for some reason or another, when music tends to excite you or not. And I agree that different genres of music go through phases. There can be very fertile periods of a certain genre, & then it stagnates a little, relatively speaking. But there's an infinite amount of music out there waiting to excite you when you find it... enough for the rest of your life!