Carl Friedrich Gauss and Richard Feynman both did great stuff until they were old. I knew from an early age that I would probably not even know what would be my career until I was at least 40, and learned the basics of art, math, computers, and music from about 10 to the present day, to be prepared (didn't know what for exactly). So now I'm 47 and making sax mouthpieces (I'm in the very center of my target market). I'm not sure what my point is with all this, but I guess what I'm saying is, just try a lot of stuff and eventually you will find that there is a demand for what you love to do. And make sure you maintain food and shelter.