Yes. On June 2, 2010, Ken Griffey Jr. announced his retirement. He was playing for the Seattle Mariners at the time.
Yes, on 2010 June 10. At age 41, he simply couldn't play well anymore.
Ken Griffey Jr. married Melissa Gay on Saturday, October 24, 1992.
41 years old. Born 21 November 1969.
His father was also a major league baseball player, Ken Griffey, his mother, Alberta "Bertie" Griffey. They both had cancer a few years ago, but I am unsure if they are still alive.