How old were they?

Onix Concepcion

SS · Born October 5, 1957

Age in each postseason series

1. 1980 World Series (October 14, 1980), Royals vs Phillies 2–4: 23 years, 9 days
2. 1984 ALCS (October 2, 1984), Royals vs Tigers 0–3: 26 years, 363 days
3. 1985 ALCS (October 8, 1985), Royals vs Blue Jays 4–3: 28 years, 3 days
4. 1985 World Series (October 19, 1985), Royals vs Cardinals 4–3: 28 years, 14 days

Age in each season

1. 1980 (Royals): 22 years, 179 days to 22 years, 362 days
2. 1981 (Royals): 23 years, 178 days to 23 years, 361 days
3. 1982 (Royals): 24 years, 178 days to 24 years, 361 days
4. 1983 (Royals): 25 years, 178 days to 25 years, 361 days
5. 1984 (Royals): 26 years, 179 days to 26 years, 362 days
6. 1985 (Royals): 27 years, 178 days to 27 years, 361 days
7. 1987 (Pirates): 29 years, 178 days to 29 years, 361 days