What difference would it make?
I'm fighting for a diagnosis for my not-quite-adult kids... because it makes a huge difference in the real world.
For us, each accurate diagnosis changed how WE handled the kids, the things we tried to teach them and HOW we taught.
Asperger's isn't a disease. It's not progressive, although interventions can help. It's really about being wired differently. They (we) think differently, process inputs (sensory, auditory, emotional, etc.) differently. They see what most miss... and miss what most see. If you understand what you are working with, it really helps. It would really help HIM, too.
But skip the formal evaluation for now, and ... maybe try reading some non-technical/non-medical books about Asperger's. Like "Look Me In The Eye" by John Elder Robinson... a bio by an Aspie. Consider what makes him tick, and how he thinks. Then, if YOU think he might be Aspie, start treating him like one. It means a major shift in thinking (including learning how to be REALLY black-and-white about what you say!), but it might make a difference in how he responds.
