Conversation so far:
When was Miyamoto Musashi's first duel?
According to the introduction of The Book of Five Rings, Musashi states that his first successful duel was at the age of 13
When was Miyamoto Musashi born?
c. 1584

Question: What happened after he moved to live with his uncle?
Self-contained rewrite: What happened after Miyamoto Musashi moved to live with his uncle?