Changes in our facial appearance are a function of many factors.  Aging is certainly what comes to mind first, but loss of skin elasticity can occur prematurely as function of one’s genetics and skin care.  Neck skin may start to hang and muscle bands may become more prominent.  Jowls become heavier.  Localized fat deposits under the chin may also result in a less streamlined neck profile and this is often not age related.  With loss of facial volume, folds become deeper.  There is not a set age when these changes start to occur and certainly when they become of concern is an individual matter.