ILLUMINATING FOUNDATION "At 40, you really need to pay attention to your skin," says makeup artist Brigitte Reiss-Andersen. "By then, most people are over the acne problems of their youth, so unless you struggle with it, don't use thick foundations—you don't need that much coverage. Instead, you need luminosity. I like shades slightly warmer than the skin tone." We love Giorgio Armani Luminous Silk Foundation.