What does it mean if you scored 145 on a MENSA IQ test and you are 14?

An "IQ" test is supposed to be an approximation of your 'mental' age compared to your 'physical' age. It's validity is broad, at best, especially with the very young or old. A 145 would mean 145% of a standard 14 year old - - about 20.3 yrs.

Answer

IQ test scores are arranged on a bell curve and a score of 100 should represent the mean, or average, score of those tested. In other words, half of those taking the test should score lower and half should score higher. A score of 145 means that the testee scored higher than approximately 99% of those who took the test. Age is not a factor on a properly constructed IQ test.

However, American Mensa does not inform test takers of their IQ when they take the Mensa exam, only that they have passed or failed. To know that a 14 year old scored a 145 on the Mensa exam would thus not be possible.

Answer

The previous answers are interesting, but there are some inaccuracies, and neither put forth a straightforward, simple answer.

If you have a score, and you have taken a Mensa test, then you have taken the "Mensa Home Test" (MHT). The MHT is not suitable for admission to Mensa (primarily because it is unsupervised). For that same reason, while your score is moderately interesting, it can't be compared to a score on a supervised IQ test. It's got the same problem as most of the internet IQ tests people claim to do so well on. It's just not a trustworthy result.

With all of that, a high score on the Mensa Home Test (and 145 is a high score) does suggest that you would get in to Mensa if you took their supervised test. As one of the previous answers indicated, the Mensa admission test no longer provides an IQ score -- it's only a pass/fail.

One other thing. The meaning of an IQ of 145 varies, depending upon the IQ test you've taken. Anyone who claims to have an IQ of 145 must be prepared to say exactly on which test this score was achieved. On some tests, a score of 145 would be achieved by about 1 in every 50 people (the top score in a large classroom of people; that's the Mensa standard of the top 2%). On other tests, a score of 145 would represent someone of truly exceptional intelligence. Such a score would be achieved by only 2 or 3 people in a large big-city high school (1 in 1000, or top 1/10 of 1%)