Maybe not the example you seek, but I learned programming (web development) from scratch when I was 37yo. I did it online (freeCodeCamp), by myself. 6 to 8 hours a day for about 8 months until I got my first job.

Now I am 41, I am still new to the new career and continuously out of my comfort zone. But once I am more used to the pace and life of a programmer, I will probably want to learn something else. No idea what yet, but I will.