As to his assertion that "at this early age IQ and other tests are not valid."

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Appropriate Age for IQ Testing
By Inderbir Kaur Sandhu, Ph.D
It is generally recommended that IQ testing for gifted children be done between age 5 and 12. Beyond 12, even the moderately gifted child is likely to encounter test ceiling effects. For the highly or profoundly gifted child, ceiling effects are in place on many measures which may begin as young as 8 (including the supplemental Stanford-Binet L-M). Research shows that for the average child, IQ test scores are reliable around age 8.