We've all heard of the Fountain of Youth - that mythical spring that grants eternally supple limbs, dewy skin, and vibrant hair to all who drink from it. Unfortunately, such a fountain is only the stuff of legends, or it certainly would have been drained by now!

Who wouldn't want to recapture their youth - or at least preserve it as long as possible? There is a wide variety of products, from wrinkle creams to vitamins, designed to do just that. The brisk sales of these anti-aging products demonstrate that, indeed, many women (and men!) intend to keep their skin looking as youthful as it can, well into middle age.

We look in the mirror and take careful note of the crow's feet, laugh lines, worry lines, wrinkles and creases that we've been collecting over the years. Like rings on a tree, these lines and creases serve to highlight the fact that we are getting older. It doesn't help to look at a picture taken of us at a young age in which none of these signs were visible. A steady stream of anti-aging moisturizers have entered the marketplace, "guaranteed" to do effective battle against the dreaded crows feet and other signs.

Of course, consumers are frequently dubious of any product that makes such claims, and with good reason. What are these magic ingredients, and how do they work? Can anyone really bottle the freshness of teenaged skin? How can you tell which is the best wrinkle cream?

An active ingredient such as retinol, a form of vitamin A, is the basic active ingredient for many wrinkle creams and retinol- based creams are indeed often more effective in the battle against wrinkles than is the case for other products. Retinol promotes the development of new surface cells and also increases the amount of collagen in the skin, the combination reducing though not completely eliminating, wrinkles.

Whereas retinol functions to reduce the severity of wrinkles, another popular ingredient is alpha hydroxy acid, AHA. AHAs chemically peel away the outer layer of skin. The concentration is very low to prevent serious damage, so the peeling effect while slight, adds a glow the skin as new cells beneath the peeled away dead cells become visible.

So, why are some wrinkle creams better than the others? The answer is most likely found in the concentration of the active ingredients. A cream might claim to contain retinol, but it could be present in such a small amount that it would be ineffective. On the other hand, a cream with a higher percentage of retinol might well be very capable of refreshing and plumping the skin for that dewy, youthful look.

If you're in the market for an anti-aging cream, make sure you have the facts. Now that you've asked, 'Why are some wrinkle creams better than others?,' you've armed yourself with the information you need to discover the Fountain of Youth for yourself!