It’s a summery Monday in Gstaad, and has just finished an afternoon of tennis with her younger daughter, Pepper, who recently turned 11. But if the renowned guru is at all worn out from the sun—or from trying to keep up with a tween—she doesn’t show it. Her animated energy is one of many qualities that can make Sturm seem younger than her 53 years. (A blonde pixie cut and petite frame help, too.) And though she has built an empire on products that bear the “anti-aging” label, her age isn’t something she’s afraid to acknowledge.

Take her decision to relocate to the glamorous Swiss enclave she now calls home. Sturm and her family moved here from Düsseldorf about three years ago, just ahead of her 50th birthday. “When you hit 50, you can do two decisions,” she says in a matter-of-fact tone.

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