The man"s parents confirmed that he was indeed their son and that he had been blind from birth, so they testified that a genuine miracle had happened. Yet they were unwilling to give their opinion about how their son became able to see or to identify Jesus as his healer. They probably knew the answers to these questions since John proceeded to explain that they had other reasons for hedging ( John 9:22-23). They suggested that the investigators question their son on these points since he was capable of giving legal testimony himself. Jewish boys became responsible adults at the age of13. The age of this man is unknown, but in view of his confident responses to the Pharisees that follow he appears to have been at least in his twenties. [source][source][source]