Ther is no maximum limit.
The highest IQ ever recorded was 228
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Your IQ does not reflect your age.
It kind of doesn't matter. Scientists are divided on what "IQ" actually means, and on whether or not a high IQ proves anything more than that you're good at the sorts of questions are on IQ tests (and, as a correllary, on what kinds of questions should be included on an IQ test).
yes
Kim Ung Yong has an IQ of 210.
IQ is not strongly associated with age. An IQ of 56 represents mental retardation, but nothing about the person's age.