"The skin cells are on a 57-day cycle," Dr. Kirby tells MDM. "That means any product that you start today takes a minimum of 57 days to make a difference. That's 10 to 12 weeks to notice a difference. Botox alone takes 10 to 14 days to start working. Filler takes a good week to settle down so you get good results. With topical applications, you see results in six weeks. A good dermatologist will start you on a good regime to help you look 10 years younger in about 10 weeks, not 10 days."

Dr. Kirby tells all of his patients that when they're starting a regimen the first thing they should do is go to the medicine cabinet and dump the contents in the garbage. That's right -- get ready to start fresh and scale back your efforts. One of the biggest mistakes that women and men make is stocking up on high-end beauty products which cost an arm and a leg. They're a waste of time and money. In fact, Dr. Kirby swears by the power of three.

"If you have more than three products, you're making a mistake," Dr. Kirby explains. "Good skincare should be simple: sunblock, retinols and moisturizer. That's 90 percent of all skincare. People are obsessed with different products with different smells and different colors. If you go to the dermatologist or get a recommendation from a friend, it's better than going to Barney's or Saks or Macy's. They make recommendations, but they're salespeople, not skincare experts, despite what they like to think. You don't need a lot of products to get great skin."

When it comes to aging, Dr. Kirby likens the process to driving a car. If somebody wants to look more youthful, then she needs to take her foot off the gas before she can put it on the brake. That means eliminating many of the factors that speed up the process such as smoking, unhealthy diet and most important, UV rays, which Dr. Kirby deems as public enemy number one.

According to Dr. Kirby, UV radiation, most commonly in the form of sunlight, causes 70 percent of facial aging. But that's just scratching the surface. UV radiation is also one of the leading contributors of skin cancer, the most common type of cancer.

Ironically, the best weapon against the deadly disease is the same one that's going to keep you growing old before your years. When patients approach him in search of the ultimate anti-aging cream, Dr. Kirby is quick to point out that it's right at their fingertips. Available just about everywhere from drugstores to gas stations, it's sunblock. Sunblock may not be able to turn back the hands of time, but it can prevent them from going forward.