The TSSAA doesn't stipulate that but the smaller private schools have one staff. The larger ones have 2. It just has to be on one campus. There are several small public schools that are this way, too. In order to have enough Varsity they are forced to pull players up. Usually only in football or basketball do you have the already old child for his grade being held back and then being 2 and half years older than some in that grade.