Like the rest of our skin, aging affects the volume found in our lips, leaving our once-plump pout looking thinner and drier over time. However, there are also additional factors—excessive sun exposure, genetics and smoking—that can greatly accelerate the process and create less-than-full lips, lip lines and lack of definition even faster.br br The silver lining: there’s a way to prevent some of it. Ahead, six ways to reverse and curb lip aging.