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Roy Halladay will be 35 years old next season.
Take a look at the Phillies roster and look how old the key pieces will be next year.
Howard, if healthy, will spend the bulk of the season at age 32. Rollins, if he returns, would be 33 years old and so will Utley. Those aren't the only guys getting up there in age, but those are the Phillies' original Big Three.
Taking a look at the rest of the lineup, catcher Carlos Ruiz will be 33, third baseman Placido Polanco will be 36, Ibanez will be 40, and even Shane Victorino will be 31. That leaves only Hunter Pence as the only regular under 30 years of age next season.
It's not as if age is only going to affect the hitters, as the pitching staff will also be getting up there in age. Roy Halladay will be 35, Roy Oswalt 34 and Cliff Lee 33. Cole Hamels and Vance Worley will each be under 30 years of age, but two of the Phillies' top three pitchers will be in an age considered past the prime for most pitchers.
The bullpen is in a little better shape as Brad Lidge, who will be 35 years old, is the only key piece well above 30. Ryan Madson will be 31, but is still obviously in his prime.
Unless the Phillies make significant changes this winter, the bulk of their roster will be on the wrong side of 30. That means that the potential to decline is always there, and some players (Howard, Utley, Rollins) have already started that downward slide.