My lay understanding of IQ tests is that 100 is considered the average, by clinicians, across age groups. I have also read that IQ scores can go up or down by, say 10 to 25, between testings and in different life stages. The conventional wisdom about IQ tests is that they measure generalized cognitive brain activity. For a typical individual free of brain disorders or brain injury, this "quotient" would not change very much no matter whether the subject was 5 years old or 75.
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100, when compared to 5 year old boys.
By definition, an IQ of 100 is average.
The average IQ is, by definition, 100.
The average IQ of anyone is 100.
The average IQ is 100