Waiting until they are old enough that they are dealing with puberty and physical changes that for my son seemed to cause more anxiety to the point that he couldn't sleep well the night before the test, is probably not a good idea. He was also in the middle of a growth spurt and I think it made his 2E issues worse. His migraines also got worse and he started to get one in the middle of testing. I wish I could have had him tested earlier so that I could compare the scores, but we had to wait until our insurance would pay for it and the only reason it finally did was because of a disability and we needed a diagnosis. He compensated for his disabilities well enough when he was younger that we could not get any kind of therapy.