How old were they?

Bill Killefer

C · Born October 10, 1887

Age in each postseason series

1. 1915 World Series (October 8, 1915), Phillies vs Red Sox 1–4: 27 years, 363 days
2. 1918 World Series (September 5, 1918), Cubs vs Red Sox 2–4: 30 years, 330 days

Age in each season

1. 1909 (Browns): 21 years, 173 days to 21 years, 356 days
2. 1910 (Browns): 22 years, 173 days to 22 years, 356 days
3. 1911 (Phillies): 23 years, 173 days to 23 years, 356 days
4. 1912 (Phillies): 24 years, 174 days to 24 years, 357 days
5. 1913 (Phillies): 25 years, 173 days to 25 years, 356 days
6. 1914 (Phillies): 26 years, 173 days to 26 years, 356 days
7. 1915 (Phillies): 27 years, 173 days to 27 years, 356 days
8. 1916 (Phillies): 28 years, 174 days to 28 years, 357 days
9. 1917 (Phillies): 29 years, 173 days to 29 years, 356 days
10. 1918 (Cubs): 30 years, 173 days to 30 years, 356 days
11. 1919 (Cubs): 31 years, 173 days to 31 years, 356 days
12. 1920 (Cubs): 32 years, 174 days to 32 years, 357 days
13. 1921 (Cubs): 33 years, 173 days to 33 years, 356 days