Uhh.... I wouldn't trust those scores. They seem to be artificially high. Average is supposedly around 100. This seems hella skewed. The test seems to top out at 160 (just an estimate) and the scores all seem to be in the higher end, indicating that they fall within the percentage of error that is common with all people. (Example: Ever get like a 97% on a test and you really know the material, but you made a tiny mistake someplace, unrelated to the subject being tested, that threw one question off?)
As for Kev's score, the time penalty probably killed him. It's kinda stupid because it penalizes people who check their answers and think things out fully.
BTW, IQs do not vary based on age. Requiring that alone tells me someone needs to do their research.
