Facial aging results from a combination of changes to the skin, muscle, fat and bones.
 people age, the loss of mineral density causes bone loss. Bone loss can affect the shape of the nose, lower jowl area, cheekbones, and middle and lower areas of the eye sockets, the researchers explained.
"As bones change, they affect the soft tissue around them, resulting in perceived decreases in facial volume," Paskhover said. "Treatment should consider the underlying bone structure."
The report was published online recently in JAMA Facial Plastic Surgery.