I'm probably not going to do anything too interesting on the grand stage again. Kids have slowed me down. I'm still sharp, but not as sharp or hungry. Yes, I'm a little sad to say goodbye to all of this, and a bit sad to see time slowly running out. All of the past situations, people, cultures, etc that I can no longer return to are a source of profound nostalgia and wistfulness, too.
I became a teacher (nominally half-time, but I end up dumping a lot more effort into my programs). I run robotics teams and engineering programs at a private school. The job contains all I like about working on engineering teams: fun problems, coaching "junior engineers", etc. I get to be ambitious-- teaching middle school students computer architecture from transistors to gates to combinatorial & sequential logic to ALUs and register files all the way up to machine code.
Um... it's super rewarding sometimes, and sometimes super not. But it is, definitively not just meh and empty. That's what's important to me right now.