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It's no secret that the Yankees are an old team; in fact, they have the oldest average age among all MLB teams. Their position players average an age of 32.7 years old, while the pitching staff has an average age of 30.3 years old (via beyondtheboxscore.com).
The captain of the Yankees and current shortstop, Derek Jeter, is 38 years old, and their resident third baseman, Alex Rodriguez, is 37. That is not optimal for two infielders in positions that command a lot of mobility and arm strength.
In order for the Yankees to compete in the future they need to start grooming replacements for these superstars.
Proof of this came last year in the playoffs. Jeter fractured his ankle during the first game of the ALCS against the Tigers and was out for the rest of the postseason. The fact is, there is no one on the bench Joe Girardi can put in who will replace the future Hall of Famer's production.
Rodriguez's struggles at the plate were terribly obvious: He was 3-for-25 (.120) during the Yankees' postseason run.
The Yankees are stuck with Rodriguez's huge contract and Jeter still has some time left in pinstripes before he hangs them up, but the Yanks cannot continue to just plug up the holes these players leave behind when they are not playing—the team needs to have solid replacements for these two guys if the Yankees are going to compete in the future.