Elasticity is the ability of the skin to snap back in place once it is stretched. In order to test the elasticity of your skin you may pinch the skin of your cheek and pull it to a moderate tug. Let go of that skin and examine it to see how quickly it returns to a normal position. In younger people the elasticity of skin is better which is related to the thickness of the dermis. In older people elasticity is poorer because there is less dermis to cause the skin to snap back to its original position. Dermis is the underside of the skin and it contains much of the collagen in the skin.
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Mehmet Oz, MD, Cardiology (Cardiovascular Disease), answered
The ability of your skin to stretch and then return to its normal state afterward is called elasticity. Unfortunately, a loss of elasticity in the skin is a natural part of aging known as elastosis. Elastosis may be worse in people who spend a lot of time in the sun.