Why do we get wrinkles as we get old?
Human skin is quite elastic. Pull on your skin and it pulls
back into its prior shape. This elasticity is, in large part, due
to some special proteins called collagens. When we are young, we
produce lots and lots of collagens and our skin is quite elastic, But
al we get older we either produce less collagen or different collagens
(I'm not sure which). Our skin becomes less elastic. Being less
elastic, it sags and folds into wrinkles.
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Update: June 2012