I think mostly, it has to do with genetics and then the normal process of getting older. My mom had extraordinary skin and , lucky me, I got that gene. At 64 I look 20 years younger and people are amazed at my age, even my derm dr was. I have very few lines and wrinkles and very clear skin. I do take care of it and have since all the "new" advances in anti aging has been around. I use sunscreen a year--a must !! .