ESPN's Baseball Encyclopedia list Juan Gonzalez of Texas at 22 in 1992 as the youngest but they are incorrect. Tony Conigliaro of the Boston Red Sox at the age of 20 won the American League home run title in 1965. Conigliaro was the 2nd youngest to hit 100 home runs. Mel Ott was the youngest by a few months.
As of the start of the 2011 season:
At 19 years, 5 months, and 28 days old, Andruw Jones of the Atlanta Braves is the youngest player to hit a home run in a World Series game when he hit one in the first game of the 1996 World Series against Andy Pettitte and the New York Yankees.
Tommy Brown, who was 17 years old when he hit his 1st home run on August 20, 1945, off of Preacher Roe. Brown was born on December 6, 1927, so he was 17 years, 8 months and 14 days old.
In MLB, that was Tommy Brown of the 1945 Brooklyn Dodgers who hit a home run at the age of 17 years, 257 days (born December 6, 1927 and hit the home run on August 20, 1945).
Johnny Bench - he was 21 years and 221 days old when he went yard in the 1969 All Star game.
Tommy Brown (born December 6, 1927) of the Brooklyn Dodgers who hit a home run off Preacher Roe of the Pittsburgh Pirates on August 20, 1945 at the age of 17 years, 257 days.
Mike trout
Barry Bonds is the youngest to hit 450 home runs
Frank Robinson hit 586 career home runs.
Most Home Runs by a Second BasemanThe player with the most home runs by a second baseman in the National League was Jeff Kent with 351 home runs. Kent played 17 years in the Major Leagues, and had a total of 377 career home runs.The player with the most home runs by a second baseman in the American League was Joe Gordon with 246 home runs. Gordon played 11 years in the Major Leagues, and had a total of 253 career home runs.
On May 23, 2009 Jason Giambi became the 44th player in MLB history to reach the 400 home run mark for a career. Through games played on May 24, 2009 Vladimir Guerrero has 393 career home runs and, barring disaster, will become the 45th player in MLB history to reach 400 career home runs.
For a career that would be Hank Aaron with 755.
Barry Bonds is the youngest to hit 450 home runs
Alex Rodrigez
The second-youngest player to hit 400 homers was Ken Griffey Jr., who reached the career mark at 30 years, 141 days. The youngest was Alex Rodriguez, who hit his 400th homer at 29 years, 316 days.
Barry Bonds, with 762 home runs.
There have been dozens of ballplayers that hit at least 412 career home runs, and as of 2009 no player has finished their career with 412.
Babe Ruth was the first player to reach 200 career home runs. The Babe hit home run number 200 on May 12, 1923.
Barry Bonds of course.
Ted Williams holds the record for most career home runs by a Boston Red Sox player with 521.
Tyler Cook of Magnolia, OH hit 29 home runs in 1999 and a total of 32 career homers.
Ozzie Smith had 8 home-runs in his career. He is a baseball player.
As of 2009 Hank Aaron has the second most career home runs with 755.
Hall of Famer Willie Mays ended his career with 660 home runs.