Here, I make, from what I can tell, the first attempt at fitting an aging curve on based on auction dollars explicitly. The review below focuses primarily on hitter aging curves, as research on pitcher curves is somewhat more scant. There are two key methodologies that have been used to derive aging curves: the delta method, and regressions. This doesn’t necessarily mean the aging curves are bad or wrong – it just indicates that auction value is volatile and there are other aspects which can affect a player’s auction value than just age. Aging Curves in the Dynasty Model: Delta MethodUltimately, I am choosing to use the delta method to construct aging curves for my dynasty model.