How old were they?

Syd O'Brien

3B · Born February 18, 1944

Age in each season

1. 1969 (Red Sox): 25 years, 42 days to 25 years, 225 days
2. 1970 (White Sox): 26 years, 42 days to 26 years, 225 days
3. 1971 (Angels): 27 years, 42 days to 27 years, 225 days
4. 1972 (Angels, Brewers): 28 years, 43 days to 28 years, 226 days