Conversation so far:
who won the first world series of poker held at binions
Johnny Moss was the first winner of the World Series of Poker Main Event.
how many times has johnny moss won the world series of poker
Johnny Moss has won the World Series of Poker Main Event three times.
who was the youngest person to win the world series of poker
21-year-old Joe Cada became the youngest World Series of Poker Main Event champion.

Question: what year did joe win
Self-contained rewrite: what year did joe cada win the world series of poker