The first young person to accept Islam was Ali ibn Abi Talib. Ali was the cousin and son-in-law of the Prophet Muhammad, and he was raised in the same household as the Prophet. He was only about ten years old when he accepted Islam, which makes him one of the earliest converts to the faith.
Ali was present with the Prophet during many of the key events in the early history of Islam. He was among the small group of Muslims who migrated from Mecca to Medina with the Prophet, and he played a key role in many of the early battles of Islam. Ali was known for his bravery and his devotion to the faith, and he is revered as one of the most important figures in Islamic history.
Although Umar ibn Khattab is often cited as one of the early converts to Islam, he actually converted several years after Ali. Muawiyah and Uthman were also early converts, but they were not among the first.