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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