This depends largely on the age of your windows and the severity of any problems you’re experiencing. If you have a serious issue, you likely have no choice but to replace your windows as soon as you can. That said, here are the average lifespans for different replacement windows in Kansas City: Aluminum Windows: 15-20 years, Wood Windows: up to 30 years (with rigorous upkeep), Vinyl Windows: 20-40 years, Fiberglass Windows: 20-40 years. Keep in mind, these are estimates ONLY. As mentioned, wood windows can last you 30 years—but they need constant maintenance to reach that lifespan. Vinyl and fiberglass windows can both last between 20 to 40 years, but fiberglass’ superior strength means it’s more likely to reach the 40-year end of the age spectrum.