The trick: Even out your skin tone.

Why: Many women bemoan their wrinkles as the reason they look older, but science says skin tone has more to do with youth (or lack thereof).

Experts say the main reason people are judged as older is not because of wrinkles but because their skin tone is not uniform-looking. Hyperpigmentation from sun damage or hormones is usually the culprit. And it's not just your face: uneven tone on the neck and chest are also dead giveaways of age.

Try: There are tons of foundation, powder and concealer products for making the skin on your face look more even. Now there are also products geared toward making the skin on your body look more uniform via pigments and light-reflecting particles. The new body BB creams use sheer pigments and light-reflecting materials to create the illusion of more even skin. (We love Urban Decay Naked Skin Body Beauty Balm.)

Any self-tanner can help skin look more uniform, and you can't go wrong with gradual formulas like Jergens Natural Glow Daily Moisturizer.

Also great: "Express" tanning formulas that develop over a few hours and can be washed off once you achieve your desired darkness. We like Vita Liberata Rapid Tan Mousse.

The trick: Use volume-boosting hair products and tools.

Why: There's a reason you've probably never seen an elderly woman with a thick, flowing head of silvery hair. Scientists have researched the thickness of hair in women of all ages and found that there's a measurable difference in the thickness of strands between young, middle-aged and elderly women. So even if you don't experience gradual hair loss (knock on wood), your strands literally thin with age.

Try: If you've ever been disappointed by volumizing products in the past, take heart: Recent advances in technology have led to products that are clinically proven to plump each strand from the inside, literally thickening its diameter with continuous use. Pantene Expert Collection Age Defy and L'Oréal Paris Volume Filler are two product lines that utilize these technologies.

In the meantime, fake thick hair until you make it. "Dry" sprays -- dry shampoo, dry finishing spray and dry texturizing spray -- are capable of http://www.totalbeauty.com/reviews/product/6561612/batiste-dry-shampoo the finest-haired ladies bodacious-looking body instantly. (We like Batiste Dry Shampoo, Redken Wind Blown 05 Dry Finishing Spray and Shu Uemura Art of Hair Dry Texture Wave.)

If you have mid-length to long hair, styling hair in loose waves goes a long way in creating the illusion of thickness. Just look at celebs like Jennifer Lopez and Julia Roberts, forty-somethings whose luxuriant waves make them look so much younger. Try an easy-to-use automatic wand like the Kiss InstaWave.

The trick: Have sex regularly.

Why: Just in case having sex needs additional incentivizing, getting down on the regular makes you look younger -- a lot younger. Participants in a study who had sex three times per week or more were perceived by a panel as five to seven years younger than their actual age.

The clinical psychologist leading the study speculates that the having sex/looking awesome connection has to do with human growth hormone, which is released during sex and is credited with keeping skin elastic. It's also probably a sign of general good health: previous studies have associated frequency of orgasm with a lower risk of mortality.

Try: We'll let you handle this one.