As we age, we begin to lose volume in the middle of our face - the cheek area. This results in a weakening of the support system in this area which causes the overlying structures/skin to begin to droop downwards. All of these changes in effect make us look older and more tired, as well as begin to cause other lines - such as the nose to mouth lines and marionette lines 

This can all be corrected with dermal fillers if varying densities that are injected into specific areas to restore this volume loss - as seen in the photos below.