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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.
Unless of course, you build a nice deck around the pool, then you can have regular steps into the pool, and height is not an issue. Still though, most above ground pools are at most 5 feet deep. Another factor in 5 ft and under pools are because of the water pressure to the walls since it is above ground. I reccommend you to check into the fiber glass above grounds. They are very sturdy.