Double chin may appear. Maintain body weight. If you yo-yo diet, the skin will stretch to accommodate your heavier weight, but it doesn't always return to its previous state when you drop those pounds. You lose skin pigment. Once-tiny sun and age spots now look like lunar craters.
Wrinkles increase, especially around the mouth.
Lips get thin, the tip of your nose will droop, and you'll form jowls. Think Richard Nixon. Medically speaking, it's when the masseter muscles around your jaws get thicker, a localized accumulation of fat similar to the syndrome women deal with in other parts of their bodies as they age. Men whose fathers had them. Beyond that, the culprit is gravity.