I've always felt like a programmer trapped in a businessman's body. How old do you find/feel is too old to jump into coding (which I've dabbled in since roughly 2000), maybe take a code bootcamp (that particular Ask HN inspired this) and try to transition to full-on developer?
There isn't a "too old". Having experience outside of the coding world provides value as you turn ideas into software. I do think ageism is real in the software world, but it is easily countered by building cool stuff. Open source and personal projects provide great resumes.