I have a 3 (almost 4) year old. She has PDD-NOS (quite like AS, but she had a language delay). We got her DX from CHOP in November, though she had already begun receiving Early Intervention services at about 20 months of age.
She's doing well, partially because of all of the resources I took advantage of for her, but mostly because she's gifted with some amazing academic ablilities. Her ability to learn is what's going to help her through it.
Things can be difficult, however, especially since I'm an Aspie Mom. I don't have an official DX, but have come to learn the reason behind my oddities through my journey of education on my daughter's behalf.
I know that right now her social situation is easy. Kids her age don't really point out oddities as cruelly as kindergarten-aged children do, but eventually, my dear little girl may find herself lonely as I was growing up.
If I'm correct, it won't matter that there's a 5 year age difference between my child and yours. They will have a common mind and therefore, I'm sure, play nicely together. If you want to talk sometime, PM me. I'd be more than happy to help.
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"If there's one thing in my life that these years have taught it's that you can always see it coming, but you can never stop it." ~Cowboy Junkies