Yes, but it’s not the same tree, itself. Box huckleberry does the same thing, and crustose lichens that one can see on boulders, in excess of a certain size are older ‘n hell, too.
But I think the oldest living thing, so far, would be the bristlecone pine found in Nevada and California. Right up there anyway.
I’m not sure. The bushes in N. PA all grew by vegetative spreading, IIRC. And I’ve never been sure what the difference is between blueberries and huckleberries. although I used to pick both and knew the difference in the taste and seediness of the fruit.
That is correct. Just up the hill from me.