
In our twenties, production of collagen (a fiber that keeps skin firm) slows and dead skin cells shed less quickly. Good genes can keep you looking young but research suggests that lycopene and beta carotene also may help by scavenging for free radicals that contribute to skin aging. Eat sweet potatoes, carrots, cantaloupe and leafy greens for beta carotene and include lycopene-packed tomatoes and watermelon in your diet.