The next pillar to focus on is skin care. Dermatologist Dr. Harold Lancer says he can tell if somebody is healthy or not just by looking at their skin. "Skin care will make you look better, and mixed with a healthier lifestyle, you're a winner," Dr. Lancer says.

He recommends three simple steps to combat aging:

• Polish: Polishing removes the debris.
  
• Cleanse: Wash off what was lifted by the polish.
  
• Nourish: Add nutrients to your skin, which will improve its antioxidant and protein levels.

In just a few weeks of following this routine, Dr. Lancer says you'll see a significant difference in your skin, and some may see results after the first use. He's even made a believer out of Oprah! "I noticed a change in a couple weeks of doing the cleanse, the polish [and the repair]," she says.

On top of a good skin care routine, it's important to avoid common mistakes—like going to bed with your makeup on. "That's the worst thing you can do, because you have all those toxic chemicals there, just eating away the entire nature of the skin," Dr. Lancer says.