I've been a coder. I've been a manager. I've owned a firm that had 15 employees.

Of all of these, I prefer to be a coder.

I'm just 5 years away from 50, and let me tell you: not only do I want to be a developer at 50, I want to be a developer at 70.

Being a developer means getting paid good money to work on problems that are perfectly suited to my INTJ / spergy personality. There's nothing else I'd rather do with my (work) time.