I am currently enjoying my second career. My first 20 or so years working were spent building computer simulators and simulations for some small companies (maybe you have heard of them) Boeing Missiles and NASA.
I must say that this was a 'blast' in many ways. I was able to be involved with the designs and development of such systems as the remote manipulator arm for NASA and a variety of different type of ballistic missiles.
My second career, I shall spend working and helping shape young minds in the world of mathematics. This seems to a very 'ballistic' environment. Working with teenagers is definitely state of the art and a challenge. Each day in school I find a new and exciting challenge. Where it will lead I do not know, but for now I will plug along and perhaps reach someone somewhere.