Last year, I was diagnosed with a chronic illness that caused me to lose a lot of weight in less than a year. After gaining some strength back, I found that my thighs and face (I'd been slightly overweight before the illness) had huge creases in them. I know about muscle toning for the body and have tried using Vitamin E, as it is a source of natural collagen on my face. It has helped some but I can't afford to get collagen injections but don't want to look older than my actual age.
Drink a lot of water. It prevents sagging of the skin. Eat also a lot of fruits and vegetables. They are very good for the skin, for the cell build up and renewal and cleansing generally. Your skin elasticity will be covered.