I'm not positive, but I believe my liner is less than 10 years old. That said, there are areas in the shallow end that have wrinkles in there that are prominent, rough as you put your feet on them. Overall, the liner is in decent shape with no tears or major loose spots. Faded areas are minimal. Is there anything you folks can recommend for removing/diminishing the wrinkles? I was reading about using a plunger, but have not tried that yet.