Sounds like a good question for Jayson Stark. Satchel Paige threw 3 innings for the KC A's in 1965 at a reported age of 58. Minnie Minosa had 2 AB for the White Sox in 1980 when he was 57. Although these were both largely publicity stunts, either one might be part of the oldest combined AB. I did some research (bored at work). Paige started and threw 3 innings for the A's on September 25, 1965. The opponent was the Boston Red Sox. They were a young team, however, and from my research (i.e. checking out the awesome site retrosheet.org), the oldest player he faced was Eddie Broussard, who was 33 at the time. This would put the combined age at 91--but you have to remember that Paige's true age was always a source of controversy. When Minosa pinch-hit in 1980 the oldest pitcher he faced was 26 year old Frank Tanana, which makes that combined AB only 83 years. Thanks! I wonder if there are any 40 year old match ups. Man, Paige was amazing. I wish he could have been in MLB the whole time.