Hi, I was told by DS7's tester that although he got 19's in several sections, he did not ceiling since there were still questions that he did not get to... So, even though a child receives 19's, it is my understanding that it doesn't necessarily equate to "hitting the ceiling" for that section. We took the WPPSI at 4y9m. Apparently, SB5 is a better test for the younger set and as others have mentioned, between 7y-8y is an ideal age for testing.