Re: 14, a pivotal age in shaping our musical tastes?
I'd say for me it was slightly earlier.
I know I was listening to Rush when I was 11-12, and The Who a bit before that, and those two bands are still my top 2 to this day. I got into U2 when I was 12 or 13.
But oddly enough, I was never into metal until I was 18, but after 18, metal has always been a big a part of my CD collection.