They found honey in a cave that was like a jillion years old and still eatable. My guess they not after the honey, but after what bees do or are: a key to all growing plants, flowers and fruits. Insane, but who knows nowadays.
10 years is just kind of a placeholder number, I remember mom being given honey that had probably sat in a cupboard for 2-3 times longer and was usable without issue.
As long as it doesn't get something in it that can be dangerous (chemicals, etc.) it's probably good far far longer.
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