I have seen a fair bit of 'red shirting' also. It seems quite strange to me - but then I graduated high school at 17 (no skips) and many high school students in my town are 19 when they graduate now. The inevitable result of 7 year old kindergarten students I guess (btw one of my sons is 6 and in first grade).

After reading Outliers at least I have a theory of why I was a crappy hockey player with my October birthday.