The original poster said by playing time. Baseball Reference uses at bats, So when a player walks or sacrifices, it did not count.You do not have to hold a bat at the plate to get playing time. You can hold a bat and only show up in 3 innings. Edwin Diaz is a 22 year old for Seattle By weighted AB, he did not play. All he did is pitch in 66 games, 66 innings and got the last out when the game was still in question in 24 of them By AB he never played. ESPN has the Twins older, but they say the Twins used 35 players, not the 52 listed on BREF. Again, go ask they guy who posted it for the source. It is probably as flawed as the baseball reference age calculator that is being quoted