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Apparently age ain't nothing but a number when you're an Olsen twin.

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According to Us Weekly, Mary-Kate Olsen is dating the brother of former French president Nicolas Sarkozy.

The man in question, Olivier Sarkozy, is younger than his lawmaking bro but, at 42, he's still old enough to be the 25-year-old's dad.

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"It's true, they're dating, and she's definitely interested in him," a source tells Us. "MK is constantly complaining about boys not being mature enough for her. She got the kids out of her system. Now being a businesswoman dominates her time, and she is rarely impressed with guys."

Olivier's resume is pretty impressive. In addition to having a former world leader in the family, Olivier is currently the head of global financial services for the asset management firm Carlyle Group.

The two were photographed at a Knicks game together on April 25 and reportedly were spotted in the Hamptons over Memorial Day weekend.