I picked 40's, although I've been dabbling in jazz for far longer. Dad had a few jazz records (Sarah, Ella, and a bunch of dixieland revival; the last ones never appealed, though), so I've heard some jazz all my life. I made early jazz purchases in my twenties (Pat Metheny, an unknown Dizzy Gillespie cassette), and then bought around twenty LPs in '86 in an effort to expose myself to more. But the bug didn't explode until early '99 while, as Rooster did, I took a jazz class at the local college. Most expensive course I ever took!