Exfoliator: "As we get older, the rate at which our skin cells turn over slows down," says Carqueville. Basically, the dead cells don't slough off on their own as fast as they once did, leaving your complexion dull and lackluster. By exfoliating regularly, you'll slough off those dead, dry cells, revealing skin that's fresh, glowy and youthful. Plus, once all those dead cells are gone, any anti-aging ingredients you're using will penetrate more effectively ... and in turn be more effective. For the most bang for your buck, look for a product that contains both mechanical (physical particles, likes jojoba beads) and chemical exfoliants (acids that dissolve the dead skin). Kate Somerville ExfoliKate Intensive Exfoliating Treatment, $85, is one good choice.