How do you get an undiagnosed 67 year old to consider that he has aspergers?

Approach the conversation with empathy and understanding, emphasizing that many adults discover they have Asperger's later in life. Share specific examples of behaviors or traits that align with Asperger's, framing them as common experiences rather than deficiencies. Encourage him to explore the topic further by suggesting resources or inviting him to discuss it with a professional who specializes in adult diagnoses. Ensure he feels supported and not judged, as this will help him remain open to the idea.