IQ changes with learning.
IQ of 126 is not bad, but to say for a 21 year old is it good? Well I mean your mental IQ wont really change from now on, I mean i doubt its changed much intellectually since you were about nineteen, but I mean an IQ of 126 is a respectable IQ and above average so I guess your doing well!
Yes
Yes, but IQ has nothing to do with age. But your IQ will change in time if it is not.
IQ test questions are used to determine ones IQ. Many are growing or trick questions as some ones IQ does not change so the test is not based on memorization of facts.
It is difficult to do so. The IQ does not change much over time.
IQ's don't change as you get old. They will stay the same always.
IQ does not change with age. Here is the population curve for IQ scores: http://en.wikipedia.org/wiki/File:IQ_curve.svg An IQ of 100 is average.
Actual IQ cannot be raised or lowered, except by physical trauma (which can only lower it). However, tested IQ can change, though usually not significantly.
IQ doesn't change with age. IQ is about how much intelligence you can gain, not how much you have. The IQ of an average person is around 100 more or less.
The a persons IQ value will not change with age so your IQ at 11 and your IQ at 111 would be the same. That being said, the average IQ is 100, so a score of 154 is extraordinary.
The average IQ for ANY age is 100. It doesn't change with age.