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I think it about 8-9 years old. And I do occasionally smell, for lack of better term, a faint fart smell when I turn on water on the top floor..
That is due to the sulfur in the water reacting with magnesium in the anode rod to create the rotten egg smell. Easy solution is to replace the anode rod with a zinc rod or a new product linked below:
I know this works with AOSmith brand heaters, not sure of other brands and I think 50 gallon is max capacity these will work with.