<p>If IQ results change as you age, then the accuracy disappears, as IQ tests are curved relative to the population as a whole and SAT tests are curved only relative to a certain division within that population.</p>
<p>Being 98% above highschoolers is not the same as being 98% above everybody, just like being in the top 2% of mensa or the top 2% of state penitentiaries is not comparable to being in the top 2% of the pop. as a whole.</p>
<p>And SAT's probably don't measure the same faculties as IQ tests. Being in the top percentile for sprinting long distances, for example, does not imply that you are in the top percentile for cooking halibut.</p>
<p>Edit: whoops, accidentally skipped the post above yours. I thought that you meant to imply that there as some inner mechanic, and that you weren't simply commenting upon the post above yours...</p>