[FWIW, most of the really really high scores I've seen on the SB-5 come from the age 5 range, and I read something at some point that claimed the SB was notorious for overscoring in this age range. Granted, any kid pulling a 150+ is one sharp kid, and scores can be low for any number of reasons, but most 150+ kids will probably not pull a similar score in a few years time. (Please note they are still wicked smart, and this is more about test shortcomings than anything else!)
This interesting as the tester who we used, who I think fairly recognizable and well known testing circles, told me that she had seen only less than a handful of children score at 150 + on SB5 and only one five year old.
