Definitions of longevity vary between clonal trees, ones where parts of the tree continue to live after the death of the first trunk or trunks, and non-clonal trees. Tree ages are derived from a variety of sources, including documented "tree-ring" (dendrochronological) count core samples, radiocarbon dating, girth-to-age formulas, and estimates from growth rates.
Definitions of longevity vary between clonal trees, ones where parts of the tree continue to live after the death of the first trunk or trunks, and non-clonal trees. Tree ages are derived from a variety of sources, including documented "tree-ring" (dendrochronological) count core samples, radiocarbon dating, girth-to-age formulas, and estimates from growth rates.
Source: Wikipedia "List of oldest trees" · CC BY-SA 4.0
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