Four players have had 60+ home runs and 50+ stolen bases through their age 21 season, in MLB history.
Ken Griffey Jr. (60 HR/50 SB)
Alex Rodriguez (64 HR/51 SB)
Mike Trout (62 HR/83 SB)
Ronald Acuña Jr. (67 HR/53 SB)
Acuña is the only player to do this in under 325 games (251).