My supervisor/colleague just asked me if someone was on AIM:
Me: “No, I just IMed him a moment ago and he was AFK.”
Him: “AFK? What’s that?”
Now, he’s not too much younger than me, but he obviously didn’t use GEnie/AOL/AIM/etc. ten-plus years ago. It made me feel old — something about the interwebnets made me feel old! Ugh!