[nicoburns]

My early experience (ages 13-19), which consists of a mix of projects in Game Maker, PHP and JavaScript is at least as important as my later professional experience.

It's not equivalent: when I got my first job at 19 I was incredibly naive, I'd barely used source control, and I had a bad case of NIH syndrome. BUT, it's given me a depth of experience that is rarely matched by my people in age group.

Actual professional experience is often quite routine, and time pressured. You don't get the same opportunity to experiment and learn things in depth that one has as a teenager. It might not be the most efficient way to learn, but it's certainly effective.

Do I sometimes feel a bit of a fraud putting "12 years of experience" on my CV? Yes. But I also know I can hold my own in a room of people who have 12 years of "real" professional experience, and that it was this early experience that enables me to do that. So it seems equally disingenuous to not put it on my CV.