When you start thinking about what your life was like 10 years ago—and not in general terms, but in highly specific detail—it’s disturbing to realize how certain elements of your being are completely dead. They die long before you do. It’s astonishing to consider all the things from your past that used to happen all the time but (a) never happen anymore, and (b) never even cross your mind. It’s almost like those things didn’t happen. Or maybe it seems like they just happened to someone else. To someone you don’t really know. To someone you just hung out with for one night, and now you can’t even remember her name.