My son is 8.7 and has never been tested. I think he has a bit of stealth dyslexia. He wasn't reading at all at 6. I should say that we are relaxed homeschoolers and I haven't pushed academics. He has always been very good at math and at 6 was already a very strong chess player. He was given the Peabody Picture Inventory which I understand is a quick and dirty IQ test, and his standard score was 140, so I imagine he is at least HG.