There are always new ADHD diagnoses among children. The plain fact is, if there is a group of 100 children and none are diagnosed with ADHD, than someone should be looking very closely at them. Someone should be making sure the ones who might be there, the ones who might need help, aren't being missed.
Diagnosis among children is to be expected. But in my age group there have been a number of new diagnoses. And there are more who would benefit from a diagnosis. I am aware that when we were at the age when diagnosis would have been the norm, ADHD was not the norm. ADHD, in fact, was virtually unknown, virtually unheard of. When I was in school, ADHD was known in the mental health community as Minimal Brain Dysfunction. Who in the whole wide world would have wanted that for a label. We'd have been shunned by the cool kids, the ones with more acceptable disorders. We'd have tried to adopt initials, MBD, to compete with others whose disorders have acronyms ... you know who you are.