Conversation so far:
Where was Mike Piazza born?
Mike Piazza was born in Norristown, Pennsylvania, grew up in Phoenixville, Pennsylvania
What were the names of Mike Piazza's parents?
Mike Piazza is the second-oldest son of Vince and Veronica.
How many siblings did Mike Piazza have?
Mike Piazza has four brothers Vince Jr., Danny, Tony, and Tommy
What school did Mike Piazza attend?
Mike Piazza attended Phoenixville Area High School

Question: When did he start playing baseball?
Self-contained rewrite: When did Mike Piazza start playing baseball?