Vinyl pool liners tend to last 8 years on average with a high rate of variation. In other words some pool liners last 3 years and some last 15 years. It all depends on good and bad maintenance, use and abuse, and good and bad luck. As a result, it is important to be a good maintainer of your swimming pool as well as it is to keep an eye out for potential abuse to your liners while or while not swimming in your pool. Once the pool holds water anything that happens to the liner and its lifespan is completely the responsibility, and falls on the shoulders of the one who maintains the pool and the one who owns the house. So good luck!!!