It may depend on the class , however they did not seem overly concerned when I spoke with them last week. I think as long as you are looking at something in the general age range it should be ok. I specifically asked about the Design a Disney Story class because it seemed to encompass a large age range ( I think 5-17). My DS is almost 10 , but I wondered IF only say teens were currently enrolled if he might slow down the older kids. They said absolutely not that they will all work on their own thing and not impact each due to age differences. As for the science class, I was careful to place him in the younger class, even though he was close to qualifying for the older group, because I knew the older group would be a bit too advanced. You should read the descriptions and place your child where you think they would fit best, and as long as you're close to that age/grade, they should be fine with it. They woman I spoke too was VERY nice and enthusiastic.