[qqwref]

I think there's sometimes a time component to these kinds of tests, so even if you get all the questions right you may end up with a non-perfect IQ. But you can't trust sites like this to give you an accurate result. No offense to anyone here, but the fact that nobody's yet got a number under 110 suggests that they're inflating the number to make visitors feel better.

As far as the "mental age" thing - that's supposed to apply to I.Q. for children (where intelligence actually is determined by age) rather than for adults. For some reason adult I.Q.s are typically higher than child I.Q.s, even for the same person. I've heard that the way the more professional I.Q. tests (for adults) work is that they look at your score and put it on the bell curve of the scores they have, and define the IQ as something like 100 plus 15 for each standard deviation your score is above the mean (and -15 for each one it is below).