Andy Pettitte has seen these startlingly young Yankees before

Andy Pettitte didn’t need the assistance of the pinstripes, like other former Yankees, whose bellies hung over their belts. When he took the mound for his first Old-Timers’ Day appearance, the franchise’s all-time leader in strikeouts still possessed a striking resemblance to the southpaw who retired five years ago. Pettitte had turned 46 two days…