For the two validated IQ tests in wide use, the Stanford-Binet and the Wechsler (WAIS), the scores form a normal distribution curve, such that 96% of the population fits within two standard deviations of the mean. The mean is 100, the SD 15; therefore 2% of the population scores above 130, which qualifies a person for Mensa. Don’t know whether the scores you guys cite are from validated IQ tests (which can only be administered by a licensed psychologist), but a 135 would be Mensa, yeah.
Something like 120 million people in the world should qualify for membership, theoretically, but I think they have 100 thousand members, tops. So it’s <0.1% of the 2% highest-IQ population who wants to make a big deal of their high IQs. :)