Researchers in Australia have demonstrated what plastic surgeons have been telling patients for years: if you wear sunscreen, you will protect your skin from signs of aging. In a study recently published in Annals of Internal Medicine, senior author Dr. Adele Green and her colleagues in the U.K. and Australia demonstrate that daily use of SPF-15 or greater sunscreen is associated with younger looking skin.
903 adults under age 55 were randomly assigned to a "daily sunscreen" group or a "use sunscreen whenever you want group." Four and a half years later, those in the "daily sunscreen group" showed 24% less skin aging than in the control group. More impressive still, unbiased scientists determined that those in the sunscreen group "showed no detectable increase in skin aging after 4.5 years."
I wear SPF-45 zinc & titanium based sunscreen everyday, rain or shine, on my face, hands, neck, and decolletage-- and I recommend that my patients do the same.