Not that I regret my choices, but that 13 is just a little too young to be career-oriented, and 16 is probably the bare minimum. I was into computers at that age, but if my decisions were based on profitability or professional viability they would have been very different.
Don't underestimate the role of a crappy jobs and bad bosses, either. Hard to say you'd want anyone to experience that intentionally, but a wide perspective is priceless and can't be taught by explanation alone.