I think our music tastes pretty much change until we hit our late teens. I remember being a kid and into the Backstreet Boys, Spice Girls, Hanson.... and anything else that I would now classify as shitty. I also used to love listening to RnB (still do).
However, I mostly like symphonic metal now (i.e. Nightwish and Epica), and pretty much anything I think has a good sound, good riffs, or at least some lyrical value (unlike most of contemporary society's music imo). For instance, I love the Beatles, Elton John, Elvis etc. yet I also love Maiden, Rhapsody, Disturbed etc. (They're not all classed as being in the same category, I just thought it would be easier to bunch them together)
... and even dabble in classical and soul music...
Edit: I don't classify Hanson as Shitty... just yet