From Allure.com

Forget praying for younger-looking skin. These rules - handed down by the top dermatologists in the country - are guaranteed to deliver brighter skin and fewer lines. 1. Wear sunscreen-and not just at the beach.
Rain or shine, "liberally applying a broad-spectrum sunscreen that contains both UVA and UVB protection every day is the single most important thing you can do to prevent sun damage and skin cancer," says New York City dermatologist Doris Day. We love Neutrogena Pure & Free Liquid Sunblock SPF 50 (for normal skin), Kate Somerville Protect SPF 55 Serum Sunscreen (for oily skin), and Clarins UV Plus HP Day Screen SPF 40 (for sensitive skin).


2. Quit smoking.
In addition to causing cancer and bad breath, smoking cigarettes "destroys collagen and elastin and decreases levels of estrogen, which is necessary to keep skin firm," says New York City dermatologist Fredric Brandt.


3. Use a retinoid.
It's the best way to slow down the clock with a cream. "Retinoids minimize the appearance of existing age spots and fine lines and prevent new ones from forming," says New York City dermatologist Heidi Waldorf. Try Dermadoctor Poetry in Lotion Intensive Retinol.

4. Stay hydrated.
No, Diet Coke doesn't count. "The more hydrated your skin, the better your wrinkles will look," says Montclair, New Jersey, dermatologist Jeanine Downie. "Drink lots of water, cut back on coffee and soda, and moisturize regularly." Try L'Oréal Paris Youth Code Day/Night Cream (for normal to dry skin) or Philosophy On a Clear Day Oil-Free Moisturizer (for oily skin).

5. Sleep well.
The expression "beauty rest" actually has some science behind it. "Not only does your skin require downtime to repair itself, but sagging skin and puffiness around the eyes make wrinkles look much worse," says Great Neck, New York, dermatologist Jeanette Graf.

Read the rest of the tips here.