Do adults with asperger's/autism "coo" and "flap" among other involuntary noises?

Flapping behavior: Some individuals with autism spectrum disorders will flap their hands and arms, jump up and down or have other repetitive movements and sounds, when excited or agitated. This is very unlikely to occur in aspergers disorder, more likely in pdd and more affected states of autism.

They could: Depending on the severity of the autistic symptoms; including the degree of intellectual impairment and communication difficulties, even adult patients can continue with these classic symptoms.