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Answer: Right now! "It's never too early to start an anti-aging routine," says Doris Day, MD, a dermatologist in New York City.
The easiest way to prevent your skin from showing signs of aging is to use sunscreen with an SPF of 30 every day. Choose a formula that contains brightening ingredients such as glucosamine to help diminish hyperpigmentation like brown spots. If you're plagued by fine lines, use a treatment that contains alpha-hydroxy acids to turn over surface cells and peptides; this will help build collagen and elastin in your deeper layers.
A final word from Dr. Day: "It's very important to get rest, drink plenty of water, take a daily multivitamin, and keep a young mind-set!"
Originally published in Fitness magazine, February 2006.