Photo: Courtesy of Colorescience
They reapply sunscreen.
You know that the number one way to prevent skin aging is to apply sunscreen, so of course you already use a morning moisturizer with an SPF of (at least) 30. What women with gorgeous skin also do: Reapply sunscreen every few hours. Sun-shielding ingredients are only effective for about two hours—long enough to protect your skin on a morning walk or commute but not throughout the afternoon. New York City dermatologist Heidi Waldorf, MD, keeps Colorescience Sunforgettable Mineral Powder Brush SPF 30 ($50, Colorescience.com
) in her bag because it's easy to brush on over makeup (and on the back of her hands or décolletage) throughout the day.