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The standard saying is if its got a 5 year warrentee on it it will last 5 years and one day.
But seriously, the life of a water heater depends on many factors, quality of water being the major one, and maintainance, such as draining them out, once in a while.
I would have imagined that yours has been serviced or even repaired at some point, with no sticker put on it, but if it were me and I saw one on sale NOW, I would pick it up, but, continue to use the one you got until it has major problem.
Gerry
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