Wholehearted agreement. I didn't touch a computer, other than the ones in the typing lab in high school, until I got my own PC for college. Here I am, the better part of two decades later, doing rather well for myself, and with colleagues and management at my last three jobs all having said I'm the best at what I do of anyone they've ever worked with.
Yeah, yeah, anecdata, but one thing anecdata can legitimately do is provide an existence proof against a universal claim like pg's.
This isn't rocket science. People who start hacking at a young age and continue very likely have a passion toward the discipline. People who have a passion for programming likely care more about it. People who care more about it are probably better.
Does this mean that the guy who didn't start until later can't be better? Not at all.
There are many things where putting more time in productively will help you get better. Similarly, wide ranges of experience need time.
At 22, the fact that I programmed since 13 probably made me better than those that just had the BS I also had. Now, at 43, I don't those years from 13-18 are a differentiator.
Isn't it sort of obvious that the person with more experience is likely to have more skills?
Of course not. The quality of their practice is rather important.