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What is a normal IQ for a 70 year old and how does it change with age?

According to research published on Consensus, the average Full Scale IQ score for adults ages 70–74 is approximately 86, based on the WAIS-IV test, a standard measure of intelligence. This provides a starting point for understanding what is a normal IQ for a 70 year old, but the full picture is far more complex and nuanced.