Therefore, a sunscreen should be applied every day at least 30 minutes prior to sun exposure. Contrary to our belief, most of us spend some time outside everyday. It is also known that most sun damage occurs in the first 18-20 years of life. During these years the skin doesn't have as much protection in the form of dead surface cells and it is more sensitive and prone to sun damage. The sun, although a major contributor, is not the only cause of wrinkles.
Wrinkles are a part of the aging process.
It is very important for the consumer to look at the active ingredients of the sunscreen, not just the SPF rating. Zinc oxide is a physical sunscreen providing both UVA and UVB protection while Parsol is a chemical sunscreen providing UVA protection only. Parsol may also be more irritating to the skin. Titanium dioxide is another ingredient with strong UVA and UVB blocking capabilities, but it is not as effective as either zinc oxide or Parsol. For the ultimate in sunscreens try SkinCeuticals Ultimate UV Defense , a great sunscreen to use after laser skin resurfacing.