Mike Trout
On April 17, 2015, Trout became the youngest player in MLB history to reach 100 home runs and 100 stolen bases. He was 23 years and 253 days old when he reached the milestone, passing the previous record-holder, Alex Rodriguez, who had achieved it at the age of 23 years and 309 days in 1999. Trout led off the 2015 MLB All-Star Game with a home run, becoming the fourth player in All-Star Game history to do so. For the second year in a row, Trout won the All-Star Game MVP Award, becoming the first player ever to win it in consecutive years. On September 22, Trout hit his 40th home run, becoming only the second Angels player to hit 40 home runs in a season. Trout led the AL in WAR for the fourth straight year.
Tom Carroll (infielder)
In 1956, Carroll was the 10th youngest player in the league at 19 years old. He appeared in 36 games that year, collecting six hits in 17 at-bats for a .353 average. For the Yankees' World Series victory over the Brooklyn Dodgers, Carroll was on the roster and in the dugout but did not play. He then spent the next couple of seasons in the minors.