Precocious Power

Ken Griffey Jr., who hit his 361st homer last Saturday against the Yankees, reached the 350-homer mark at a younger age than any player in major league history. Though Junior, who won't turn 30 until Nov. 21, has a head start on Henry Aaron, he still has a ways to go to pass Aaron's 755—a figure that the Hammer didn't reach until age 42. (For comparison's sake, 35-year-old Mark McGwire, who had 463 career homers at week's end, didn't hit his 350th until he was 33.) Below are the players who reached 350 homers at the youngest ages.

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