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Playoff Performance by Age

There's no question that scoring rates drop during the playoffs, but James Mirtle wonders if it's fair to count "every game as being equal, whether those postseason games were played as an 18-year-old rookie, 27-year-old sniper or a 37-year-old greybeard..."

At first glance, it seems like a reasonable thing to do. The ratio between playoff and regular season scoring is shown below for ages 18-40:

And it's incredibly rare to play in the playoffs at either an old or young age - 94% of players in the playoffs are between 20 and 34 on January 1st of a given season. A linear fit indicates no relationship between age and scoring ratio, while a polynomial fit indicates a slight difference. Counting all games as equal seems like the right thing to do.