"All good things must come to an end" may come off as insulting in an exchange between a prospect and a veteran, yet the idiom rings true for many aging players.
Outliers like Jamie Moyer (49) and Tim Wakefield (45), Julio Franco (48) and Omar Vizquel (45) slowly age to become athletic dinosaurs but remain productive until their last baseball breath.
For the majority of ballplayers, however, the wear and tear of a 162-game season takes a toll on ones body. Eventually, the childhood dream of throwing the final out of the World Series or hitting a walk-off grand slam has either been accomplished or missed.
The ever-rotating carousel of baseball talent continues to churn out the next Cy Young winner and batting champ; and it will carry on as long as the great sport of baseball lives.
The following five veterans are trending downwards and may be replaced before season's end.