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I don't know what the previous oldest is, but I'll hazard a guess. I think it might be the honey mushroom, which is a fungus and is the largest living thing on earth (depending on your definition of a single living entity).
I also seem to remember learning about some trees that are supposed to be a million years old, and whose roots are all connected but have different trunks and foliage above ground. I can't remember what they are called but I think they are somewhere in the U.S. I guess the scientists must have changed their minds about these being the oldest.
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