Holdback Troll: You can't just register your kid for a random age group. He has to be in that grad year. To play for the 29s, he must be a 6th grader this year. For 28s, has to be in 7th. Very few, if anyone, actually holds their kid back for lacrosse. There are usually other reasons. Being a holdback IS an advantage, but it usually doesn't last long. The best kids play up, not down.