Don’t wait for the first crow’s feet to appear before you reach for that little tube. Even women in their twenties should be using a topical retinoid, unless they’re pregnant or nursing. Retinoids, which contain vitamin A, are one of the most potent agents for preventing and reversing sun damage and signs of aging. And, they’re the ultimate multi-tasker. They speed skin renewal by shedding dull, pore-clogging cells and increase collagen production to prevent wrinkles.