Alex Rodriguez turns 35 on July 27. Babe Ruth was 36 years and 196 days when he hit his 600th home run, so A-Rod will certainly become the youngest player to join the 600 club.
All-time leader Batrry Bonds (762) was 38 when he hit No. 600. So was Willie Mays (660), Ken Griffey Jr. (630) and Sammy Sosa (609). Hank Aaron (755) was 37.