Over time, your skin produces less collagen and elastin which is responsible for providing the soft, springy texture of the skin. The facial muscles and retaining ligaments beneath the skin also become weaker leading to further drooping. The natural fat pads in the face lose volume and begin to descend under the influence of gravity. This process is worsened by exposure to sunlight which damages skin cells reducing the production of collagen and elastin further. A broad-spectrum sunscreen will lessen the damage caused by sun exposure and ultimately lead to less sagging.
Weight loss, particularly significant weight loss over a short time or due to illness, is another cause of sagging due to the loss of fatty tissue in the face. Smoking also damages skin cells and leads to a degree of dehydration of the skin and sagging is more commonly seen and often worse in people who smoke.
Although there are many treatments aimed at increasing collagen and elastin production, skin rejuvenation and anti-ageing, there are several treatments that work specifically when sagging is an issue. Thread lifts actually lift and anchor the tissue that has dropped and hold it in place, dermal fillers can replace lost volume and lift the tissues below due to volumisation and collagen-stimulating dermal fillers can be placed in vectors to stimulate collagen production which then contracts and tightens causing an upward pull. Radio-frequency can be applied to sagging skin which leads to skin tightening and a lifting of the lower face. Finally if the sagging is too pronounced or non-surgical techniques have failed, there is always the option of surgery.