10/9/26 : Did Ya Know - MLB Debuts
According to data found on Baseball Reference 255 players made their major league debut this past summer (2026 season) - ages ranged from the youngest at 19 (Konnor Griffin - Pirates) to the oldest (Brian Keller - Phillies) at 32. Here’s a detailed breakdown of data over the past six seasons.
2026 : 255 players made their debut
Average Age of debuting player : 25.1
Youngest : Konnor Griffin - 19 - Pirates
Oldest : Brian Keller - 32 - Phillies
Team with the most - Giants - 17
Team with the least - Royals - 2
Pitchers : 149 - 58 %
Position Players : 106 - 42 %
Age 19 to 24 : 125 - 49 %
Age 25 to 29 : 123 - 48 %
Age over 30 : 7 - 3 %
2025 : 243 players made their debut
Average Age of debuting player : 25.2
Youngest : Didier Fuentes - 20 - Braves
Oldest : Tomoyuki Sugano - 35 - Orioles
Team with the most - A’s, Marlins (tied) - 15
Team with the least - Yankees & Phillies (tied) - 4
Pitchers : 141 - 58 %
Position Players : 101 - 42 %
Age 19 to 24 : 108 - 45 %
Age 25 to 29 : 126 - 52 %
Age over 30 : 8 - 3 %
2024 : 255 players made their debut
Average Age of debuting player : 25.0
Youngest : Jackson Chourio - 20 - Brewers
Oldest : Brady Feigl - 33 - Pirates
Team with the most - Giants, A’s & White Sox (tied) - 13
Team with the least - Phillies - 4
Pitchers : 148 - 58 %
Position Players : 107 - 42 %
Age 19 to 24 : 119 - 47 %
Age 25 to 29 : 130 - 51 %
Age over 30 : 6 - 2 %
2023 : 261 players made their debut
Average Age of debuting player : 24.9
Youngest : Eury Perez - 20 - Marlins
Oldest : Drew Maggi - 33 - Pirates
Team with the most - Reds - 16
Team with the least - Phillies - 4
Pitchers : 154 - 59 %
Position Players : 107 - 41 %
Age 19 to 24 : 114 - 44 %
Age 25 to 29 : 138 - 53 %
Age over 30 : 9 - 3 %
2022 : 303 players made their debut
Average Age of debuting player : 25.3
Youngest : Francisco Alvarez - 20 - Mets
Oldest : Jason Krizan - 32 - Giants
Team with the most - A’s - 19
Team with the least - Dodgers - 4
Pitchers : 179 - 59 %
Position Players : 124 - 41 %
Age 19 to 24 : 118 - 39 %
Age 25 to 29 : 161 - 53 %
Age over 30 : 24 - 8 %
2021 : 265 players made their debut
Average Age of debuting player : 25.3
Youngest : Wander Franco - 20 - Rays
Oldest : Mickey Jannis - 33 - Cardinals
Team with the most - Orioles - 16
Team with the least - Braves & Cardinals (tied) - 3
Pitchers : 161 - 61 %
Position Players : 104 - 39 %
Age 20 to 24 : 101 - 38 %
Age 25 to 29 : 150 - 57 %
Age over 30 : 14 - 5 %
Average Age of debuting player - 1950’s to 2020 :
2020 - 24.9
2019 - 25.0
2018 - 25.2
2017 -25.1
2016 - 25.3
2015 - 24.9
2014 - 24.9
2013 - 24.8
2012 - 24.9
2011 - 24.8
2010 - 24.8
2000 to 2009 - 24.4 to 24.7
1990’s - 24.1 to 24.3
1980’s - 23.6 to 24.0
1970’s - 23.0 to 23.5
1960’s - 22.5 to 22.9
1950’s - 23.0 to 23.4
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