No idea as not tested - but I will add that up until a year ago and the finding of this site, I simply thought that DS was ahead and smart, but really had no idea what IQ numbers meant, and never thought of him in terms of that. And as far as ages on toys - I too thought that meant, hey this is just a choking hazard, so for liability we have to mark it for a much older child. Or, wow, they are really off on their estimates of what a child will like/read/use. But there is no way I would have been even close to a guess had I not started reading heavily on this forum, and many gifted children books. Now I feel like a have a fairly good feel for it, and if we choose to test him, I am curious to see how close I will come to the number too.