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Sunscreen can protect against wrinkles. Australian researchers found that fair-skinned volunteers who applied SPF 15 lotion to their head, neck, arms, and hands every morning for four and a half years showed 24 percent fewer signs of aging than those who had not. The benefits were the same for middle-aged participants, those with moderate skin damage, and those with younger-looking skin. Because ultraviolet rays damage the collagen that gives skin its plump, youthful appearance, it makes sense that blocking those rays would slow skin’s aging. “If you don’t need a flashlight to see outside, you need protection,” says dermatologist Doris Day.