You could start now, and spend another forty years learning about the sea without running out of new things to know.
That's the only hitch in learning: it's humbling. The more you learn, the more you realize how little you know. Anyway, all that's a long way around saying that it's crazy to do things just to prove you can do 'em. The more you learn, the more you'll find yourself doing things you never thought you could do in a million years.
