You could probably be my father if you worked hard on it, but let's forget the whole mid-life crisis thing and all the stuff that goes with the process of aging
I am constantly trying to get to the point, where I can say to myself, that I am sure I can make my living out of music related activities. That's a huge plan. You have to write things down. To give each thought a chance, cause you can never know what will "click".
People will laugh. At your gazillions of ideas that may sound stupid, but as a whole they will form your plan. It's down to small things that you make your money on.
I'd start with writing a blog themed around the idea of "I am 42 and I've left my day job to become an electronic musician". Will be popular as hell.
Only because people want to live other people's dreams.
To make my post a bigger mess, I will add an idea that has recently sprung into my head. I'll be starting an "electronic music foundation" quite soon. Teaching people, organising events (not only parties), spreading the word, living the dream...
The good thing is, that as long as you do things for public good - in this case, spreading the culture - your government will most likely be helpful, providing some funds and support.
My point is, you can't concentrate on making career strictly out of making music. That won't do, nowadays, and will largely depend on your luck. But you can do several other activities that meet with making music somewhere, which are more reliable as a "money source".
Write down things you're good at and try to use your skills in music industry. You may be talented as hell, but It's probably too late to start a career making music. But you can certainly succeed as a patron of arts. Which comes close, gives you opportunity to work with music-related people and will open up possibilities of creative collaborations or whatever you can think of.
It was a pretty much a flowing stream of thoughts, but I hope you got the idea.