In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Q: Context: Mets Manager Bobby Valentine was immediately prompted to remove Yoshii from the game in favor of Orel Hershiser Link Information: Robert John Valentine (born May 13, 1950) Question: What age was the Mets' manager when he switched Yoshii for Orel Hershiser?
A:
Answer: 49