Think about your last statement - how would raising the IQ requirement for entry fix that? The IQ requirement is based on the top X % as of Y day. Everyone is measured against the same yardstick when they are judged for entry, it's just the yardstick happens to be relative to the intelligence of the rest of the population. If the population changes over time, then that person doesn't become any more or less intelligent absolutely, only relatively. Raising the IQ entry requirement would not change that. If you raised it to 150, then in 10 years the people who get 150 will be more intelligent than the people who get 150 todayHence somebody who say joined Mensa 50 years ago with an IQ of 132 and be in the top 2% then might only score 117 today and be in the top 5 or 10% only and hence would never get into Mensa.
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The only way to ensure that MENSA always represents a certain intellectual ability is to re-test all members when there is a new yardstick. That's somewhat impractical.