In The Watchtower August 15 in the topic: "Let the Many Islands Rejoice" appears the following paragraph:
Then, however, it came time for a serious decision. Would I accept a scholarship to go to university? As much as I loved books and learning, I am grateful that my mother had helped me to acquire a stronger love—one for Jehovah. (1 Cor. 3:18, 19) So with my parents’ consent, I left school and started pioneering in January 1971 at the age of 15, having received the required school certificate.
He basicly says that he could start the university at 15. Do you believe?