According to Alicia Barba, a Miami-based dermatologist, the first signs of sun damage do generally show up in your thirties, as your skin’s reparative abilities begin to weaken — think mild brown spots, crow’s feet and dull skin. “When you’re young, it’s easy to think just about your face, but we need to protect our neck, chest, hands, and feet as well,” she adds. Here, Barba breaks down the best skincare products for your twenties that every woman should be using before she turns 30 – but those 30 and older should also take notes.