No one should play up unless your schools program needs to fill roster spots to field a team. For programs that have enough, or too many that they need to make cuts, bringing kids up should be out of the question. I assure you that it is not in the best interest of the younger kids. They will be resented by the older players who were cut or who's friends were cut. Not what you want for your child who will be entering high school within a year or two. They will have bier time. Let the high school aged players have theirs.