How old were they?

Jimmy Stewart

LF · Born June 11, 1939

Age in each postseason series

1. 1970 NLCS (October 3, 1970), Reds vs Pirates 3–0: 31 years, 114 days
2. 1970 World Series (October 10, 1970), Reds vs Orioles 1–4: 31 years, 121 days

Age in each season

1. 1963 (Cubs): 23 years, 294 days to 24 years, 112 days
2. 1964 (Cubs): 24 years, 295 days to 25 years, 112 days
3. 1965 (Cubs): 25 years, 294 days to 26 years, 112 days
4. 1966 (Cubs): 26 years, 294 days to 27 years, 112 days
5. 1967 (White Sox, Cubs): 27 years, 294 days to 28 years, 112 days
6. 1969 (Reds): 29 years, 294 days to 30 years, 112 days
7. 1970 (Reds): 30 years, 294 days to 31 years, 112 days
8. 1971 (Reds): 31 years, 294 days to 32 years, 112 days
9. 1972 (Astros): 32 years, 295 days to 33 years, 112 days
10. 1973 (Astros): 33 years, 294 days to 34 years, 112 days