The current Yankees' roster gets a lot of flack for being old. Which, to be fair, is somewhat true. The Yankees have a couple of key players that are far closer to the end of their career than the beginning. However, none of the current Yankees are as old as Johnny Cooney was when he played for the team.
Cooney made his major league debut with the Boston Braves in 1921 at just 20 years old. He didn't become a real regular in the majors until 1924 when he made 19 starts for the Braves.