As new cases of autism have exploded in recent years—some form of the condition affects about one in 110 children today—efforts have multiplied to understand and accommodate the condition in childhood. But children with autism will become adults with autism, some 500,000 of them in this decade alone. What then? Meet Donald Gray Triplett, 77, of Forest, Mississippi. He was the first person ever diagnosed with autism. And his long, happy, surprising life may hold some answers.