I've done a lot of thinking about aging, milestones, and accomplishments lately. I just sent off what may well be my last book. I'm helping plan my fiftieth college reunion. I used to be the youngest person in the room when I started teaching; now, I'm often the oldest one when I'm in a meeting.At the same time, I'm no where near ready to retire. I have too much energy and the world has too many problems for me to hang it up and go play shuffleboard and go on cruises. So, here are some thoughts