Difference in IQ based on Age
By Inderbir Kaur Sandhu, Ph.D
My child is 6 years old. Since the IQ tests are apparently
normed for age by the year, would he more likely test as
having a higher IQ if he is tested late in his 6th year
rather than when he has just turned 6? Thank you.
A: It is true that standardized
tests are normed based on age in a particular year. It is
assumed that children of a certain age in a particular year
should perform close to accuracy on an IQ test, regardless
of whether the child is born close to or far from the
birthday month during the time of the test.
Of course, common sense is that the more experience a child
has (which translates to being older), the better the
performance, which may appear that if a child is tested late
in his, say 6th year, he may perform better than if it were
given earlier. Having said that, standardized IQ tests are
designed in such a way that this should not affect the
results, at least no more than a point or so more.
Therefore, it is perfectly fine to test your child as I
doubt the difference would be that drastic for any