Volume loss is a natural part of the aging process, but there are a couple of culprits who merit much of the blame — collagen and elastin. Collagen is a protein that is responsible for providing structural support under the skin to keep it firm and taut. Elastin keeps the skin supple and pliable.
The problem is that after we hit the age of 20, our bodies begin to produce dramatically less and less of these two proteins that together keep the skin looking young. In fact, from your 20th to your 50th birthday, your production of collagen drops 30 percent. Hello sunken cheeks and saggy skin.