Ken Griffey Jr. retires at age 40
August 31, 1990: Ken Griffey Jr. and Sr. get back-to-back hits in father-son debut with Mariners – Society for American Baseball Research
Ken Griffey Jr. Is Coming Back, Again - Lookout Landing
Ken Griffey Jr. Retires After 22 Seasons - The New York Times
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Seattle Mariners great Ken Griffey Jr. bows out at 40 with unexpected retirement – Twin Cities
This Day in Braves History: Atlanta acquires Ken Griffey from Yankees - Battery Power
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Hall of Famer Ken Griffey Jr. joins Mariners ownership group
Arizona women's basketball: Taryn Griffey, daughter of Ken Jr., retires due to injuries - Arizona Desert Swarm
Ken Griffey Jr. retires at age 40 with 630 homers - The San Diego Union-Tribune