Is there a way to help an adult friend who i think has asperger's?

As an adult: Remember you are not a therapist, even if you were, people must actually want your guidance, it's not to be cured, and these folks' brains are wired differently. I suspect most adult aspies nowadays know of the entity, and value its many plusses. Cool kindness, invitations to events he might enjoy, and mild, infrequetn feedback ("i liked it when you..." "have you considered...").