Sun damage accounts for 80% of the effects we attribute to aging. A new study published in the Annals of Internal Medicine found that applying sunscreen every day prevents photoaging of the skin. Study participants who applied sunscreen each day on their head, neck, arms and hands and reapplied it as necessary were 24% less likely to show any cutaneous signs of increased aging than those who applied sunscreen at their own discretion. Dr. Alster recommends that her patients apply a broad-spectrum SPF daily. In addition to facial application, don’t forget the neck, décolleté and other exposed areas. It’s also a smart idea to keep sunscreen in your car for application to the backs of your hands.