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IQ changes with learning.
IQ is not based upon age. A persons IQ doesn't even change very much through out life, only about 5 IQ points at the most. Therefore asking the IQ of a twelve year old is not a very good question. The average IQ is about 100 though. To find out the exact IQ of a certain person they would have to take an IQ test.
you can take online IQ tests
Take an IQ Test on the Internet
Male and female blood pressure, IQ, SAT and other test scores, life of a light bulb, weight and height, shoe sizes... Hope this helps!
The average IQ of a pre-teen is around 90-110, similar to the general population. IQ scores can vary among individuals, and it's important to remember that IQ is just one measure of cognitive abilities.
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Take a valid IQ test or some sort of standarized test that corresponds to your IQ.
Yes, but IQ has nothing to do with age. But your IQ will change in time if it is not.
a normal Japanese IQ test
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Psychologists and psychiatrists offer IQ testing or at the very least can direct you to IQ testing centers.