But any deep facial wrinkles that emerge before age 50 are generally attributable to the cumulative effects of sun exposure, cigarette smoking, or both, according to cosmetic surgeons. This observation springs into dramatic relief when you compare the skin on your face and the backs of your hands to the relatively smooth, monotone skin on your buttocks. Aside from Father Time, the only skin-aging factor beyond your control is genetics. Static wrinkles are always visible, even when all the facial muscles are resting. Static wrinkles tend to develop in skin that has thinned and stretched as a result of premature or natural aging processes.
Dynamic wrinkles occur in people of all ages, even young children.
Dynamic wrinkles are seen only when you are smiling, raising your eyebrows, or otherwise animating your facial expression. How Sunlight Harms the Skin Think back to those golden summers of your youth. No one told you that decades later your skin would pay the price for those sun-soaked days in the form of dryness, wrinkles, fine lines, liver spots, and perhaps even skin cancer. Government health officials have estimated that half of a lifetime's worth of UV exposure occurs by age 18. To make matters worse, the thinning of the Earth's protective ozone layer is believed to be amplifying UV radiation levels.