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Your question on longevity will be a tough one to answer at least from the hobbyists point of view.
Remember most hobbyists have limited pond space and their constant search and purchases (and hence constant replacement of kois) for better kois will mean that most kois will not last long enough in their ponds. It is not uncommon to see kois still alive in their teens in our hot weather. I have highlighted "alive" because to me, a more relevant question should be how long a koi maintain its beauty before they go downhill. Many hobbyists, myself included, would replace any koi which is on the downhill as there is nothing more to look forward to, and it is no fun seeing them go downhill.
Despite our warm weather and given good water/food conditions (and probably the right bloodline) we can still have kois at their best at age 5-10years old. What about your experience with kois having the luxury of the wintering effect?
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