I'm not nearly as arrogant as to think that I know everything in my particular domain(s) of interest. I can look at whatever language(s) I consider myself proficient in and name half a dozen things in half as many seconds that I know nothing about.

I simply disagree with the "You have to have coded for years before going to college for coding to be a good coder" line of thought. You have to have the time, yes. But, imho, it doesn't have to come from college and it doesn't matter when you start.