You must be 16 yo and live in your parents basement.
Double that, oh and I'm not living in my parent's basement… I put myself through college as part of my enlistment deal w/ Uncle Sam with zero money from the parents. — I've been interested in OSes for more than a decade, and actually got one up to the point where it could recognize user-input, execute [internal] commands, and change screen-modes (it was pure TP7, save for two or three lines [IIRC] of inline-assembly) before I got stumped on memory-management and swamped with "real-life".