Lip lines are a type of expression wrinkle, not the tiny grooves or chapped lines on the lips themselves, but the vertical lines above the upper lip. Frequently puckering the lips can result in lip lines over time. Young skin is full of collagen, so the skin bounces back from these movements. But as collagen levels start to decline, these lines don’t fill out so quickly. These lines are bound to happen, but here are some tips to delay their arrival for as long as possible.