The lips are particularly vulnerable as they have an extremely thin outer layer, which becomes progressively thinner as the body ages. Over time, the corners of the mouth may droop, as if you were frowning. The V-shaped area of the upper lip known as the Cupid's bow begins to flatten out, contributing to the thinning lips. Your lips lose their youthful fullness. Vertical lip lines that can cause lipstick bleed may also begin to appear. Using JUVÉDERM® VOLBELLA® can Rejuvenate or Enhance Your Lips.