Some of it is genetic. The connective tissues loosen and your facial muscles and ligaments, etc. drop to reveal the fat below. Some say facial exercises can help restore the tone of those tissues and lift the face back over the fat. I don't have the issue, but I've spent countless hours of my life smiling about nothing so my face is pretty buff. And wrinkly, but not saggy. Yet.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.