I am not an expert, I just did some research on my own. If you know more than I do please share. 1. There are normed rating scales. I assume OP was also tested

I am not an expert, I just did some research on my own. If you know more than I do please share. 1. There are normed rating scales. I assume OP was also tested on one when s/he filled out those additional forms. If I recall correctly they use the 5th percentile. 2. DSM-5 still requires symptom onset before the age of 12. As far as I know some researchers advocate raising the age limit further into adolescence, but don't want to get rid of it.