Yup. It's basically a requirement around these parts. Most better athletes go to private schools, and each private school flunks them (I refuse to whitewash the practice by calling it "reclassing") so they can gain a competitive advantage.
Just saw a kid who had a June birthday, and already started school late, "proudly announce" on twitter that he was transferring to a private school and "reclassing." So, in June of this year, he was already 16, and he's going to be a freshman (again) this fall. Depending how long their school year is, he could be 17 before he finishes his freshman year.
We've gotten decently far in the process of looking into the private schools, but I refuse to let my kid be flunked, so I've held off broaching the subject with the coaches, and we've kind of pulled back on it. Straight A's, all Honors courses, and I'm going to flunk him? Crazy. And, on the other hand, if he goes and doesn't get flunked, he'll be competing for spots against kids up to 2 years older than him, but in the same "class."