I've actually read that most wrinkling occurs from sun damage. After all, if you look at the areas of your body that aren't regularly exposed to the sun..they don't become leathery and the skin doesn't thin and sag nearly as much. Even with all the plastic surgery these days, you can usually tell a woman's age by her hands..cause it's often most neglected, even by those who use sunscreen regularly.
My aunt and my mom are four years apart, my mom being older..and both are in their 50's. My aunt has tanned her whole life, and continues to do so to this day, my mom only tanned once or twice in her life. You can see a huge difference in their faces, even though my mom is actually older! My aunt has very deep lines by her eyes and around her mouth. However, if you stand about 2 - 3 feet away from my mom..you see almost no lines at all, and close up, mostly just fine lines. It's insane the difference between them..and being that their genes and lifestyles are similar except for the tanning, it's obvious what the culprit is. I'm 28, and just barely starting to see fine lines...i'm hoping that 10+ years of daily sunscreen use will keep those lines away!
Kay