This year has been a big one for pop culture anniversaries. Friends turned 10 making Ross's son, Ben, almost 20 now. Some of our favorite albums from the '90s turned 15 this year — including Britney Spears's . . . Baby One More Time and Christina Aguilera's divalicious debut — and many killer teen movies did too. While exciting, it's not all sweet nostalgic feelings — it forces us to look at just how long it's been since those good old days. Keep reading to see 25 mind-blowing pop culture facts that will make you feel ancient, from the demise of YM magazine and other 2000s trends to exactly how long ago Mary-Kate and Ashley Olsen made a splash in matching outfits.