Just chipping in here because there are fewer girls diagnoses than boys.
My DD1 was diagnosed at 6... after the school asked if she could be referred. They felt she was 'bright' but couldn't focus long enough to do any work ..basically a non stop chatty, impulsive funny and infuriating child with the attention span of a gnat and constantly fidgeting, on the move. Zero organisational skills.
She went on Ritalin (and melatonin as she never slept..never had as a baby either) and we tho we were reluctant (partly as she never ate either and was very very thin) but it was , for her, a magic bullet.
She stayed on it til she was 14 , came off it for a few years then went back on it before A levels.
Still a disorganised, impulsive person with the fastest speech of anyone I know... but... at 6 years old she announced to the diagnosing paediatrician that she was going to be a doctor...
And she is :) She's 25 now... and an adult with AD(H)D. The ritalin has allowed her to focus enough to use her brains, and her hyper speed mind and ability to keep going has been an asset throughout her medical training... she has passed every stage with flying colours and patients love her friendliness, her ability to think of 100 things at once!
She is still medicated (and still very thin ..that never changed) but in many ways her ADHD is what has made her who she is.
Just thought I'd chuck that out as a (hopefully) positive thought :)
(She still drives me NUTS when she comes home mind... disorganised, scatty, motormouth!)