1.Slather on the sunscreen. We know, we know—you've heard it a million times, but wearing sunscreen is the single easiest way to look younger for life. "Ninety percent of wrinkles are from sun exposure," says Day. "It's so much easier to prevent the damage than it is to fix it afterwards." That means no slacking during winter months either, when rays are just as strong and can reflect off of buildings and sidewalks. Look for a formula that offers broad-spectrum protection to guard against UVA rays (the ones that cause premature aging) and UVB rays (one of the main causes of skin cancer). Try Philosophy Shelter Broad Spectrum Sunscreen in SPF30. [Source: WomensHealthMag.com] ..