Jack O'Brien
LF · Born February 5, 1873
Age in each postseason series
- 1903 World Series (October 1, 1903), Americans vs Pirates 5–3: 30 years, 238 days
Age in each season
- 1899 (Senators): 26 years, 55 days to 26 years, 238 days
- 1901 (Blues, Senators): 28 years, 55 days to 28 years, 238 days
- 1903 (Americans): 30 years, 55 days to 30 years, 238 days