Great article on aging sluggers by ESPN.com's Bill Simmons. My favorite quote:
That's what happens to beefy sluggers on their way out: Their knees go, they stiffen up, bat speed slows and, in the blink of an eye, they're done. Beefy sluggers are like porn stars, wrestlers, NBA centers and trophy wives: When it goes, it goes. You know right away.
Note, you can follow Bill Simmons on Twitter. He's really funny.