Washington Nationals manager Davey Johnson congratulates pitcher Edwin Jackson as they walk off the field in April after the Nats beat the Cincinnati Reds 4-1. Mr. Johnson, 69, stays active mentally, physically and socially and controls stress. (Associated Press)

Washington Nationals manager Davey Johnson congratulates pitcher Edwin Jackson as they walk off the field in April after the Nats beat the Cincinnati Reds 4-1. Mr. Johnson, 69, stays active mentally, physically and socially and controls stress. (Associated Press)