Sheehan was surprisingly appointed to manage the San Francisco Giants in 1960 at age 66 after the firing of Bill Rigney, who had the team in second place in the National League with a 33-25 record. It didn't pay off. Sheehan went 46-50, the Giants finished fifth and his managing career was over.
BOBBY MATTICK
He's the oldest rookie manager to start a season at age 64. He took over the Toronto Blue Jays in 1980, leading the expansion team to a 67-95 mark - its first season shy of 100 losses. They went 37-69 over the strike-shortened 1981 season, and Mattick declined an offer to return for a third season.