From 2004 through August 12, 2012, Derek Jeter has hit 122 home runs.
As of August 26 in the 2007 season, Lance Berkman has hit 24 home runs. Berkman wound up the 2007 season with 34 home runs.
Barry Bonds hit career home run number 762 on August 5, 2007.
Mickey Mantle hit 54 home runs in 1961Roger Maris hit 61 home runs in 1961Tino Martinez hit 44 home runs in 1997Eddie Mathews hit 47 home runs in 1953Willie Mays hit 52 home runs in 1965Willie McCovey hit 45 home runs in 1969Mark McGwire hit 70 home runs in 1998Kevin Mitchell hit 47 home runs in 1989Johnny Mize hit 51 home runs in 1947Dale Murphy hit 44 home runs in 1987
On August 4, 2007, Alex Rodriguez became the youngest player to hit 500 home runs (32 years, 8 days).
Yes, both players hit home runs before they were 20 years old. Ty Cobb hit 1 home run in 1905 at the age of 19 and Staub hit 6 for Houston.
Ty Cobb hit 2 home runs before his 20th birthday and 6 home runs after his 40th birthday. Rusty Staub hit 6 home runs before his 20th birthday and 2 home runs after his 40th birthday. Gary Sheffield became the third player to accomplish this. He hit 4 home runs as a teenager and, through games played on May 1, 2009, 1 home run as a 40 year old.
Don Drysdale was the last pitcher before Mical Owings to hit two home runs in a single game. He was pitching for the Los Angeles Dodgers against the Milwaukee Braves on August 23, 1958 when he hit a 3-run homer in the 4th inning and then a solo home run in the 6th. The Dodgers beat the Braves 10-1.
Paul O'Neill hit 281 career home runs. Paul hit 185 home runs with the Yankees and 96 home runs with the Cincinnati Reds.