Break out the cupcakes! A new study compared faces of identical twins. They found: The heavier-set twin looked several years younger. Why? Seems extra fat plumps faces and naturally fills lines.

But before you binge on Ho-Hos: Try these healthy, youth-ifying tips:

1) Stop all these extremely aging makeup sins, such as dark lipstick and shimmer eyeshadow (see the whole list of sins, plus photographic evidence, here).

2) Beware of bad sunscreen. (Here's a list of the best ones.) You can find your best sunscreen with this quiz.

3) Age 30+? Meet your new best friend, Retinol. Here's why.

4) Apply skin serum before your moisturizer -- it affects how well it works! Actually, here's the whole order your morning regimen should follow: Cleanser, exfoliant, toner, any prescription products, antioxidant serum, eye cream, redness relievers, moisturizer, sunscreen.

5) Pay attention to the backs of your hands; they show age easily. Use sunscreen on them, and moisturize frequently.

Need more?

- Top-rated hand creams

- Tips for fighting acne and aging

- Who needs to use wrinkle serums?