Great for you; that's really fantastic and by posting about it, I hope you make a lot of other middle-aged people comfortable with persuing education.

> My goal is 5-8 more classes for a second degree in math (major).

Why not get a masters degree?

Edit: answered here: https://news.ycombinator.com/item?id=43282629

> Wish me luck!

You don't need it. :)