help me

It'll be a copybot that we missed somehow. Notice how they never replied. Thanks for finding the original.

I think this time to throw us off the scent it introduced some spelling errors, dropping 's' at the ends of words, changing 'the' to 'a'. Why would someone register a second account, not customise it, and post almost exactly the same message, but with additional errors?

NAS Moderator please could this thread be locked, and NAS38067 moderated?

There is another Thread with exactly this same Opening Post. :

https://community.autism.org.uk/f/parents-and-carers/12315/how-do-i-tell-my-son-he-has-asperger-s

But THIS here Thread claims to be almost one month old. Are you a "copybot" or are you related to this other person, perhaps?

"Autism Is?" is also a great book that explains some aspects simply

Agree, this book is brilliant! We got it for our daughter. 

Have your ever read 'All Cats have Aspergers' a wonderful book about cats and how unique they are, in relating to yourself and autism.  It's a children's book which I love as I have a liking for cats too.  

http://www.autismforthvalley.co.uk/files/5314/4595/7798/Attwood-Tony-The-Complete-Guide-to-Aspergers-Syndrome.pdf 
This is the one my parents and I read when I was first diagnosed, but I was a fair bit older than your son and it may be a little dry for him. That said he could still enjoy it if it resonates with him as much as it did with me and it is definitely a useful one for you as a parent. 

You say you don't want to go into the reason you didn't tell him then, but could you share the reason you DO want to tell him now? What's changed in your situation? Maybe you could start with that in your conversation with him.

When did he do his diagnostic assessment? Will he still remember it? Could you start with "remember when we went to see Dr. X and we did Y". Ask him what he thinks about the idea that he might be different- I strongly suspect your son has already realised that he is unusual compared to other children at nine. Most of us do at a lot younger than you would perhaps expect. 

I would also say that it is important for his self-acceptance to frame it in a positive way. Autism spectrum conditions are just a difference in the way the brain works, it's not that he's defective or wrong (although the world/society around us is certainly not built with us in mind, and we can struggle for it). Children can automatically assume that autism is a bad thing and outright reject a diagnosis that could bring them substantial support on that basis. Also emphasise that it's something he's always had and always will- nothing about who he is has changed as a result of diagnosis, nobody's going to try and change him in a way he might not want, you just understand more now. 

Perhaps mention one of the many gifts that people with Asperger's may have; increased attention to detail, true honesty and loyalty in friendships, great problem-solving ability or extensive knowledge in a chosen subject. (Not all of us have all of these, and there are more associated with the condition- a quick google will find you a few lists of "positive traits associated with AS"! Pick what fits your son.)

Hope things go well!