‘Jowls’ describes the sagging, loose skin below the jawline, which most people develop with age. A number of factors such as smoking and sun-damage can also accelerate the natural ageing process, resulting in a loss of the skin’s collagen and elasticity, which can contribute to having jowls. Genetics may also take part in the development of jowls. It has also been suggested that sleeping on your front or side consistently may also cause jowls to form over time.