Hi Janet. This is ,indeed, a very delicate matter. I was only diagnosed when i was 15 and ,at that age, i wasnt told by anyone how serious my condition was, i dont blame anyone because my parents, themselves, were still learning what it was and it comes as a big shock to find out something like that, i understand them completely. I ended up finding out the worst way, i looked up as much as i could at the time, on the internet especially; at that time, i couldnt really speak english and the portuguese websites weren't (and still aren't) updated at all. They were very poor in information, so what i can say is that, personally, finding out, in my teens, that i had a life threatning ilness was very dificult and it jeopardized so much my adolescence to a point where i got depressed , i just couldn't accept it. So as far as my experience goes, adolescence is the wrong period to find out about something like this so yes, i would advise you to talk to him while he's a child.