He reached the test ceiling of greater than 16years and 10months on 10 of the 13 subtests. On the 3 tests he scored less than the test ceiling: i.e. an age equivalent of 14.2 years (Picture Arrangement), 14.6 years (Coding) and 16.6 years (Symbol Search), all of these three subtests used speed for bonus points or higher scores.
Thanks for posting this. You know, until you said this I wasn't really thinking about my DS's other subtest scores being at the ceiling because some of them were in the 14-16 range. But for 7 of the subtests (including all 6 subtests on the VCI and PRI sections) it does show him as >16:10 (he was 11:11 at the time so similar to your DS). Does that mean there were potential ceilings on those sections where he wasn't at 18 or 19 but was at the highest age equivalent they report with that test? Perhaps not because on the VCI subtests he did get to the 19s with that same age equivalent. Maybe Dottie knows

This board is very helpful, thank you!