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Your Face in Your 30s continued...

Remember, though, these options don't come cheap, with costs averaging about $2,000 per treatment, depending on the extent of what you have done.

Also, if you are considering these treatments in your 20s or 30s and anticipate continuing them for some time, note that there are few studies on the safety of decades-long continued use of facial rejuvenation injections. While doctors don't anticipate any problems, there are no guarantees. Since 2009, the FDA has required all of the botulinum toxin products -- including Botox, Dysport and Myoblock -- to include a special warning on their labels. It states that the toxin may spread from the area of injection and cause problems with breathing or swallowing or even death. Most of these problems occurred in children with cerebral palsy, however, and not when used for approved cosmetic purposes.   

Again, the best way to optimize results and ensure safety -- at any age -- is to seek treatment with a board-certified dermatologist or plastic surgeon.

Your Face in Your 40s

As you enter your 40s, lines begin to appear around your upper lip -- and if you smoke, they'll come faster and go deeper.

"This is called the 'purse string' muscle," Marmur says. "And because this area is prominent, it's more at risk for sun damage. So if you skipped out on sunscreen in earlier years, you'll see the results here first."

Goldberg says be prepared to see more wrinkles in your forehead and crow's feet around your eyes plus a deepening of the smile lines.

Best Self-Care: Moisturizers need to be richer and thicker, say experts, and if you haven't already started, this is the decade to use a night cream.

"You do need stronger moisturizers and you definitely need to use a night cream after 40," Goldberg says.

The reason, he says, is that when you sleep, your body goes through a natural rejuvenation process. You're also not exposed to all the dirt and pollution that assaults skin during the day. So, Goldberg says, products used at night tend to get into the skin a little better and may offer better results.