AP Medical Writer
WASHINGTON (AP) -- If worry about skin cancer doesn't make you slather on sunscreen, maybe vanity will: New research provides some of the strongest evidence to date that near-daily sunscreen use can slow the aging of your skin.
Ultraviolet rays that spur wrinkles and other signs of aging can quietly build up damage pretty much anytime you're in the sun -- a lunchtime stroll, school recess, walking the dog -- and they even penetrate car windows.
Researchers in sunny Australia used a unique study to measure whether sunscreens really help amid that onslaught. Participants had casts made of the top of their hands to measure fine lines and wrinkles that signal sun-caused aging.
The research found that even if you're already middle-aged, it's not too late to start rubbing some sunscreen on -- and not just at the beach or pool. The study of 900 people under 55 compared those randomly assigned to use sunscreen daily to those who used it when they deemed it necessary.
Daily sunscreen use was tough -- participants did cheat a little. But after 4
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