Why is going by age such a tough concept? It's done in every sport, except Lacrosse!! Just because a kids big, doesn't mean he is physcially more mature, he may have a 7ft father. It's about physical maturity. When your a year and half or two years older than the other kids (regardless of hieght) it's an advantage. Things like muscle developement, motor skill, hand eye, speed, lateral movement, all generally get better as a child gets OLDER!!! That's the point! You can't dispute it, it's just basic Physiology. It's no big deal, it's just fact and reality.