I am sure this has been discussed before but what do you think about this question? Keep your child in their own age group and play until he/she ages up or play in higher age groups sooner? I know if your child dominates their age group, it is time to move up. Have a friend that is playing their child that is only 14 years old with a losing record up in the 18's. He is not winning in his own age group and occasionally gets a lucky draw and wins a match in the higher age group. Is this playing up helping this child's tennis development or hurting it?