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Marshall Brickman sees an upside to aging.  He's perhaps best known for collaborating with Woody Allen on films like Annie Hall and Manhattan. When he was 27, he was the head writer for The Tonight Show, and, now in his mid-sixties, he's co-writer of the Broadway hit, Jersey Boys.  

And it just so happens that Brickman is also something of a mathematician. Get a calculator and follow closely. Brickman figures that if you marry someone younger than you, he or she ages more quickly than you as time passes. In other words, the ratio of your age to your spouse's declines. Now that's fancy math.