
As long as Major League Baseball has had Rookie of the Year awards, veteran players from outside traditional minor-league structures have been winning them.
The first was Brooklyn Dodgers first baseman Jackie Robinson, who took home top honors in 1947 in his age-28 season—with racism and World War II to blame for him not debuting earlier. Boston Braves center fielder Sam Jethroe was 33 in 1950; he'd been a longtime Negro League outfielder for the Cleveland Buckeyes. In 2000, Seattle Mariners pitcher Kazuhiro Sasaki was a 33-year-old NPB lifer.