The difference in their ages is 26 years, 256 days. According to the Elias Sports Bureau, that is the third-largest age difference all-time between two starters and the largest since 1965.
Bumgarner will be 22 years, 255 days when he takes the mound, and Moyer 49 years, 146 days. On Sept. 25, 1965, Bill Monbouquette (29 years, 45 days) of the Red Sox opposed Satchel Paige (59 years, 80 days) of the Kansas City A's, and the difference was 30 years, 35 days, the largest all-time age difference.
Paige also was involved in the second largest age difference -- 29 years, eight days -- on Sept. 22, 1953. He was 47 when he pitched for the St. Louis Browns against 18-year-old Bob Miller of the Tigers.