My oldest niece (who is my little sister's daughter) graduated college two months ago and wasn't born until after 9/11. I think that was the most recent thing to make me feel old. I'm class of '99 and currently rewatching Buffy the Vampire Slayer, depicting kids who were also class of '99, and I now identity with Giles the school librarian, and in fact I'm exactly the same age as Anthony Head was when he took the role. Charisma Carpenter and Nicholas Brendon have now both been over 50 for years and Alyson Hannigan will be 50 in 7 months.