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Typically, above-ground pools will last around 10-15 years on average, but can last shorter or longer depending on the circumstances. The somewhat limited lifespan can be a result of many different, varying factors, the greatest of which is the maintenance.
Making the world better, one answer at a time. In general, the typical gunnite built-in pool will last a good 30-40 years before any significant re-work to the pool itself is usually needed. Given proper care and maintanence, there is no reason why a well-contstructed pool can't last 50+ years.