If I had to make a suggestion, I would say start with a little mobile app development. Write for Android or the iPhone or something. Draw from your experience to come up with something to write - maybe an electrical debugging tool? Or a training application for someone junior? Doesn't have to be novel, even; just build one or two apps for a phone. And, if possible, try to get one out onto one of the app stores.
A couple of advantages that come from this:
1) You get some practice doing real programming with a modern language and modern environment.
2) You get to see whether you really like programming as you're older.
3) It's easy to learn on your own (lots of tutorials out there)
4) You'll have a great differentiator when you do apply for jobs (because we all know age discrimination exists and you've got a great sales pitch around 'well, I've got a few Android apps that I wrote and sell.'
5) You might even make a little money on the side.