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The average first baseman has an OPS+ of 119 Doc.
And that 121 OPS+ is biased by one fluky big year back to star performance...it's really 4 110-119 OPS+ seasona and one more glory year.
And I don't think it's a worst-case projection to pick the most similar players and discover that they all fell to average production rates for first basemen by age 32.