My gas water heater is 13 yrs. old. It's still going strong despite never having been flushed, or anything else for that matter. I guess it could go at any time though.
I have noticed that the more modern water heater installations, at least in my area, usually have a pan installed under them for the inevitable day when it blows out to catch the first bits of leakage.
Definitely going that route when I replace mine.
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