Conversation so far:
What was Walter Hagen's style?
Walter Hagen was widely known for his dashing wardrobe while playing; this featured expensive tailored clothes in bright colors and plush fabrics.
How wealthy was Walter Hagen?
Walter Hagen may have been the first sportsman to earn a million dollars in his career.
What did Walter Hagen do with all his wealth?

Question: What year did he become a millionaire?
Self-contained rewrite: What year did Walter Hagen become a millionaire?