Re: 14, a pivotal age in shaping our musical tastes?
Perhaps it's because of the age. At about that time children begin to assert who they are by discovering what's "theirs". I was 14 in 1980 and I do recall breaking away from the family by choosing who I liked as opposed to listening what was already in the family record collection. But for me it started a bit earlier because my parents would take me music shopping when I was much younger, so consequently music from around 1974 I consider "my own" too. It's when you start to assert an identity, eh?
But big albums for me were Chicago II, V and VIII, Yes' Fragile, Rush' A Farewell To Kings, among others. But I continued to listen to a lot of jazz, Broadway shows (Jesus Christ Superstar and Godspell), and a couple of albums by Bach and Mozart too.