Whether you're 23 or 53, it's important to know how to care for your skin. After all, makeup (even these expert tips) can only do so much, right?

Think you know your retinols from your anti-oxidants? Prove it by taking this quiz. It'll test your anti-aging smarts -- plus you'll get some tips to improve your skin. Before I took it, I had no idea that UVA rays are responsible for those lovely wrinkles we can get from the sun, not UVB rays. Did you know that?

• Need to brush up a bit on your skin care know-how? Check out this guide.

• Luckily, you don't have to spend a lot to have a gorgeous complexion, as this comparison guide shows.

• Did you know that this body part shows your age more than anything else? Find out what it is and how to protect it here.