They calculate the number by dividing the person's raw test score with the person's age. So the younger the test taker is, the higher the resulting number. If Chump took an IQ test as a teenager, say 18, the raw score is divided by 18. But if he takes the test again as an 80-year-old-man, the score is divided by 80 so it brings the final number way down.
Does he know 5 times more correct answers now than he did as a teenager? It's highly doubtful. So the older he gets, the lower his IQ score. This is why IQ results don't really mean much for older adults. I'm an older adult myself (I'm 75) and I'm sure of this. In my grade school days I tested at somewhere around 135, but my age was about 10 or 11 then. If I took the same test now and got all the same answers correctly (the same raw score) I would be below 100 now due to my age.
Bear in mind that standardized IQ tests do not ask trivia or general knowledge questions, the tests are designed to gauge the person's reasoning ability. Slow or deficient readers are penalized if they fail to quickly discern the word problems or visual puzzles. We all know that Chump fits the description perfectly. (It doesn't mean he's retarded, but he is a slow reader.)
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