Getting old

I'm ripping all my sister's Coldplay and Robbie William's albums. Aside from the morality of stealing such a large quantity of music wholesale, what has happened to my musical taste? It seems like only yesterday I was mercilessly mocking her for owning these gems, and now I'm admitting that they're really quite good. I was chatting to a guy in the pub the other day when Oasis came on the ipod and we both agreed that we didn't really used to rate Oasis much but now it sounds like "proper music". Lady Gaga has a lot to answer for.