The durability of pergolas depends on the material. Wooden pergolas often hardly last 5 years, while aluminum and vinyl pergolas typically last 15-20 years. It also depends on the quality of the material, i.e. pergolas that are made of high-end aluminum alloy can even last for more than 30 years. It also depends on the climate of where you live. If you live in a humid climate with lots of storms, you pergola might last shorter than if you live in an average climate. One of the most important factors is the budget; if you buy an expensive, quality pergola, it will definitely last longer than its cheaper counterparts.