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Amazon CEO Jeff Bezos and his wife, Mackenzie Bezos, arrive at the Robin Hood Foundation’s annual benefit in New York on May 12, 2014.

In one sense, Amazon.com founder Jeff Bezos and his ex-wife, MacKenzie Bezos, are nothing special.

By finalizing their divorce this month, they join the millions of Americans now splitting up in middle age. The rate of divorce after age 50 has doubled in the U.S. since 1990.