Elastin is a connective tissue protein that is responsible for the skin’s elasticity. Think of a child’s skin versus your grandmother’s skin. When you pinch the skin on the cheek of a child, it feels firm and it snaps back immediately. When you pinch the cheek of your grandmother, the skin will feel thin and flabby with slow to no snap back. This is the difference between the abundant amounts of collagen and elastin with youth and with the lack of in aged skin.