[geijoenr]

I have the feeling is in midlife when people switch careers, so 43 doesn't sound strange to me.

You have to be ready to take an income cut though, at least at first. Other than that, I don't think you should be afraid.

That 10k hour rule is stupid. Talent is what makes the difference, either you have it or not. Regardless, it has nothing to do with switching jobs, most people moderately suck at what they do and make living and live happy lifes.