I've recently started asking myself whether I only have inattentive ADD or Asperger as well. I haven't received a diagnosis for Asperger yet (only ADD) but I really suspect it. One feature I have which someone told me is characteristic of Aspies is that I look much younger than I really am. My puberty was delayed when I was younger. Is that characteristic of Asperger?

It may be true but I highly doubt that as a characteristic of Asperger's disorder. More on asperger's can be found here:

http://aspergers.com

Good luck.

Andy...