I think her point was that we can't magically transform random person x, at the age of 22, into a hacker. Not that it can't happen at all, but also that it can'

I think her point was that we can't magically transform random person x, at the age of 22, into a hacker. Not that it can't happen at all, but also that it can't be forced. At least, that's how I chose to take the paragraph. Rarely when someone says "this doesn't happen", they mean it is impossible. Just unlikely. If I've spent the last 10 years being interested in computers, it is unlikely that at the age of 22 I'm going to walk into a mechanic and decide then and there that I'm going to work on cars for the rest of my life. Does it happen though? Definitely. Is it common? Doubt it.