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.
Nate Berkenstock
Nathan "Nate" Berkenstock (September 17, 1832 – February 23, 1900) was the earliest-born professional baseball player, a year older than the next-"oldest" player, Lew Carl, who was born in 1832 and played in one game for the Baltimore Canaries in 1874. Berkenstock played in just one pro league game: the game that decided the first professional baseball league championship in the United States, in 1871. He was Jewish.