Your Clueless- your still talking potentially up to 2 year age gaps with older/ re-classed kids: 14 vs 16, 15 vs 17, 16 vs 18. If you think a 15 yr old has the same physical development as a 17yr, your nuts. 10% will have equal physical development , the rest wont. Age based is the only way to go. It levels the playing field and truly represents a kids skill. In 3 years, that's how it will fly