Duke Magazine notes that the bones in the skull continue to grow as people age. The forehead tends to move forward while the cheekbones move slightly backwards, causing subtle changes to the human face. Because the facial bones tilt forward as people age, it causes sagging of the soft tissues.
Live Science reports that as people age, their skull bones lose volume. Eye sockets grow wider and longer. The bones in the jaw drop in angle. The angle of the nose may also be somewhat reduced as the person ages. All of these changes in the shape of the skull bones contribute to making the person appear older.