Hi, there is no height restriction that I've heard of - just have to make sure that kids are decent swimers, or you are 'nearby' at the base of slide if not. There is a very strong current. Do note, though, they won't let you stand at the very base for catching them, but you can kind of hang around sort of close by. You can also get a life vest for free at the Community Hall for your length of stay (which is located right around the corner from the pool).
Have fun!