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Longevity The average above ground pool will last 7-15 years before the structure gives out, although their liners will last 5-9 years before they have to be replaced. For an inground structure, the longevity really is contingent on the type of pool. For example, fiberglass should last well over 20 years. Vinyl pools should have a structure that lasts, but their liner needs to be replaced on average every 6-11 years. As for concrete, their structure should also last a long time, but keep in mind they need to be resurfaced every 9-13 years, which can get very, very expensive.
The vinyl liner in an above-ground swimming pool, or an in-ground vinyl liner pool, will not last forever. The recommended lifetime for this pool component is usually set by the manufacturer and given with optimal conditions for chemical use, activity, sun damage and damage due to weather conditions.