The nice part about signing up for the Explore through a talent search is having all younger kids at the test. There were some pretty big 6th graders, but some small 3rd graders, and the vast majority seemed to be 4th & 5th graders when GS10 took it last Feb.
FWIW, GS10 came out with that 'exhausted, but exhiliarated' feeling. He was 9 yrs, 7 months.