Dave Arrigo, Pittsburgh Pirates

One of the most important pieces of information we must consider when evaluating a prospect is the player’s age relative to the level at which he is playing. If a player is considerably older than most of his competition (or conversely, if he is much younger than his competition), we must account for that when projecting future performance. If you are someone who generally pays attention to the various minor league systems around baseball, you probably have a feel for what it means to be old or young for a level. For example, a 25-year-old who is tearing up High-A is often less impressive than a 19-year-old who is simply holding his own in the same league. If we merely compared each player’s overall statistics, without considering their ages, we would...

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