Stadium Boom Amounts to Fountain of Youth for MLB Parks (@ BtB)

This is the Part I of my two-part visualization of ballpark construction in MLB and the NFL. The NFL post will be strictly Rational Pastime property. For now, however, enjoy:

In 1960, the final season before expansion, the average MLB ballpark was 37.3 years old. In 1977, the final season of the expansion wave, the average age sat at just 20.8 years: a drop of 16.5 years of age—nearly one year per season.

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