Over the four days leading to the NBA draft, you're going to see a lot of numbers, some of them more important than others when it comes to predicting how players in their teens and early 20s will ultimately perform in the NBA. The most meaningful might be a simple one -- age.
No matter how you study the history of the draft, the results are clear: Younger players end up faring better than older ones. Even during their first seasons, younger rookies develop more compared to their college performance than older ones, a gap that grows as they continue to progress toward their peak.