After defeating cancer and winning the Tour de France seven years in a row, Lance Armstrong is tackling a new challenge: a fifteen-year age gap between him and new fling Ashley Olsen.

The new couple was spotted at New York hotspot Rose Bar on October 29 by an eyewitness who tells Us Weekly, “they were being very flirtatious.” The next night, the May-December duo took in Broadway play Young Frankenstein before dinner and wine at the Waverly Inn.

And while Armstrong prepped to run last Sunday’s New York City Marathon, the lovebirds shacked up at luxe hotel Soho House, where they both had booked rooms.

Sources tell Us, however, that Olsen shouldn’t let herself get swept away by the whirlwind Big Apple romance. “Lance is a candidate for a midlife crisis,” says a source close to the divorced father of three.

Indeed, Armstrong might already be in his midlife crisis: he recently split from fashion designer Tory Burch and broke off his engagement with Sheryl Crow in 2006. “Next week, he’ll be on to someone else,” another insider says.

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