I went to visit a friend (Hi, PenguinMommy!) and realized a guy I'd studied abroad with in college was in that same area. Ish. It's a big area, and I wasn't sure exactly where he was... Turns out he was plenty close and we were able to meet for lunch.
At which we did the math. First time we've seen each other in 13 years. It's not that having friendships last for 13 years makes me feel old, it's the haven't seen you in 13 years and still friends that boggles my mind.