One of the big developments of the past year in baseball is how many young players have risen to the top of prospect rankings. A look at MLB Pipeline's Top 100 Prospects list will show you just one player in the top 10 older than 21.

Of course, while there's a bumper crop of teenage shortstops at the top, there are still plenty of intriguing prospects of all ages. With that in mind, for the second year in a row, we'll take a look at the very best prospects of each age in a nod to Will Leitch's long-running column .

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First, some ground rules. In this exercise, any player who has not exhausted rookie eligibility and is considered a prospect is eligible. That means that unsigned international players under 25, high schoolers and college players count, in additi

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