True, I still find that weird. If you are going to be an old rich guy who remarries a much younger women, you might as well go really young. Get a 30 year old, go for the full 40 year age gap instead of the 20 Sloan did.
Good thing Sloan made the choice he did. If he would have married a woman 40 years younger, she probably would have bailed (with a big alimony package) at the first sign of Altzheimer's.