The averages are for all players,. no matter how good, right? Given how many players have brief stints and are done before 25 (thereby getting zero thereafter) is that even accounted for?
Even if it is limited to players that actually cover the age range, IMO better players generally have longer peak periods. Part of the reason they are higher level is that they usually maintain their conditioning, plus they have skill levels which will support them for a longer time.
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