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A grove of Bristlecones keeps a silent vigil atop the White Mountains of eastern California. “The idea of a single individual surviving for 5,000 years rooted in place is truly remarkable and I think strikes awe in most of us,” said UA dendrochronologist (Image: Rex Adams/LTRR) A grove of Bristlecones keeps a silent vigil atop the White Mountains of eastern California. “The idea of a single individual surviving for 5,000 years rooted in place is truly remarkable and I think strikes awe in most of us,” said UA dendrochronologist Chris Baisan, who first established the age of Prometheus, the oldest known tree.