Thin Lips - As we age, we lose volume in our face and that can affect the lips. The lips will deflate and then lose color. The edges of the lips called the vermillion border also become less well defined as we age. Sun exposure, smoking and volume loss are the main components of thin lips. Lips that have good volume can be enhanced by giving more definition to specific areas of the lips. Lips that have lost their borders can also be more defined with current techniques.