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- The tree's age was determined by carbon-14 dating of the root system, which found roots dating back to 375, 5,660, 9,000, and 9,550 years. Carbon dating is not accurate enough to pin down the exact year the tree sprouted from seed; but, given the estimated age, the tree is supposed to have sprouted around 7550 BC. For comparison, the invention of writing (and thus, the beginning of recorded history) did not occur until around 4000 BC. Researchers have found a cluster of around 20 spruce trees in the same area, all over 8,000 years old.