The context of age in the minor leagues

Posted October 12, 2017

The edited article below explains some thought on age and how it plays into minor league baseball.


The context of age in the minor leagues


by Jeff Moore

August 13, 2013


You see, family members of minor leaguers don’t understand the hierarchy of minor league baseball, the one that separates the prospects from the non-prospects and doles out playing time based on draft status and signing bonuses.

But this type of context is important for fans trying to comprehend the numbers they’re seeing from minor league players. Twenty home runs from Player A and Player B may signify two extremely different things, depending on the context in which they take place.

The average age of players in the International and Pacific Coast Leagues (Triple-A) is around 26. As I explained a few weeks ago, Triple-A includes a lot of veteran major leaguers. The average age for the Double-A leagues is just slightly over 24. For High-A it’s a hair under 23 and for Low-A ball it’s around 21-and-a-half. Most prospects are below the average age for their league, as the league ages are skewed higher by the non-prospects who spend multiple years there and fail to advance.


Age is one of the most important forms of context in the minor leagues. For 2012 first-round pick Lance McCullers to be striking out over a batter per inning in the full-season Midwest League at the age of 19 is impressive. For Dodgers Mexican left-hander Julio Urias to be doing it at 16 is downright astonishing. At the age of most high school sophomores, Urias has been competing against the likes of Byron Buxton and Carlos Correa, and succeeding. The context of his age is incredibly important.


Being young for a level is not, in and of itself, an indicator of success. Often, a player having been young for his league is used as an excuse for average play. The Mets did this for years in the late 2000s, promoting their international prospects aggressively despite never seeing them truly excel at any given level, with Fernando Martinez becoming the tragic example of what this strategy can do to a talented player. It isn’t the only reason he failed, but it certainly didn’t help.


Being old for a level can have a negative effect as well. Andrew Lambo, a former top prospect with the Dodgers, was just called up by the Pittsburgh Pirates on Monday. Lambo toiled in the minors for four months this season despite being a corner outfielder with 31 home runs in the upper minors in an organization with terrible major league right fielders. Why? Because he just turned 25, and the Pirates couldn’t be sure of the legitimacy of what he’s accomplished.


Sure there are other reasons Lambo was ignored while his major league team had a need for the one thing he’s good at—his past three well-below-average seasons come to mind—but among the chief reasons for Lambo’s continued presence in the minors is that 24-year-olds are supposed to dominate Double-A pitching. Most major league 24-year-olds would. To do so is not the great achievement that his 31 home runs would suggest it to be.


None of this means that Lambo can’t contribute, of course. It just means that we mustn’t get overexcited about his arrival in the majors. Ruf has turned into a very usable player in the major leagues, but he’s probably not the middle-of-the-order bat many Phillies fans were hoping he could be. He is, however, better than Delmon Young, but that’s a comparison for another day.


When looking at minor league numbers, age should be mentioned in the same breath as walk rate, strikeout rate, and wRC+ (one of my favorite all-encompasing stats, because it involves, you guessed it, context). Compare a player to his peers, but make sure that he was in fact playing against peers. If he is dominating against older competition, get excited, but don’t use young age as a crutch for mediocrity. In the same light, don’t completely discount performance because of age, but use it as a way to temper expectations until a player proves himself against more appropriate competition.



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