Around 8-9 years old.
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IQ tests are normed for all age groups. And so the average IQ of all age groups is 100.
Typical: the ordinary
The IQ of Gauss was at LEAST over 200 (some say 230!!!). He was correcting his father's payroll at age three and replicated anarithmeticsequence equation at age 5 (Sn=n/2(a1 +an)!! He was much more than your typical genius.
There is no typical number.
The typical can of pop is 355 ml.