How does a professional baseball player know when it is time to retire?

Pitcher Tim Wakefield, at the age of 45 and with 19 years in the major leagues behind him, announced last week he was leaving the Boston Red Sox and putting away his trademark knuckleball.

Wakefield had a productive career that saw him win 200 games and two World Series championships with the BoSox but, when Father Time catches up with you, it is time to go, and Wakefield realized that.