What constitutes an "oldie?"

So what exactly is "old" music? My parents listened to music from the 50's and early 60's when I was a kid in the 90s. So to me, music from the 70s and 80s was fairly new. My classmates in junior high thought I was nuts, and that 70s and 80s were oldies. At the end of high school, my favorite radio station had the Retro Hour and played music from the 80s.





So is retro different from an oldie? I suppose 90s music is retro now, or is it just old?



Discuss.