This morning, I met a former student at the railway station. I remembered him only as a mild nuisance, not truly nasty. He was very happy to see me and told me enthusiastically about his job as a painter, which he was enjoying, and that he played professional table-tennis. He asked about some of the other staff and laughingly said he'd been "a little shit". I always like to see students who have done well. They don't have to be academic, just happy. It's one of the pleasures of working in the school system. It lets you know that you've done okay, too, especially when you get a visit from a kid you yelled at (as I have, several times).
Of course, sooner or later, you get reminded of your age when a teenager says, "You taught my mother." Ouch! :-)