It differs depending on countries.
They are mostly in the senior grades.
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The 20-65 group!There are no standardised age groups, so if you want to compare age groups you need to specify the age groups you wish to compare.
Types of normalisationFirst Normal FormSecond Normal FormThird Normal FormBCNFStudents Age Subject Anne 20 Biology, Maths flora 23 Maths devin 16 Maths
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IQ tests are normed for all age groups. And so the average IQ of all age groups is 100.
100 is average reguardless of age. IQ tests are designed for different age groups.