Jowls can start appearing as early as your 30s. However, they're usually more commonly associated with middle age and beyond. Factors such as lifestyle choices, sun exposure, and genetics can all contribute to the speed at which sagging jowls develop.Jowls can start appearing as early as your 30s. However, they're usually more commonly associated with middle age and beyond. Factors such as lifestyle choices, sun exposure, and genetics can all contribute to the speed at which sagging jowls develop.