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Twenty-one, 26, 31—what’s the significance? Is age merely just a number, or a baseline for seasonal performance? How can we quantify this?
Aging curves—also called aging patterns or age factors—show the relative performance of a group of players for each age, usually either showing how much (in percentage terms) a statistic improves or declines from one age to the next, or how the production at any age compares to the peak age.
One method used for aging curves it to simply add up the stats for every player at each age and look at the resulting sums. This is flawed, however, for it doesn’t account for the fact that there are many more players at age 24 than at age 34—the differ...
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