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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Pando is a vast quaking-aspen clone in Utah: its many trunks are genetically part of one living lineage, growing as new shoots emerge from an underground root system. But the striking claim that Pando could be 80,000 years old is an uncertain estimate, not a measured age. Scientists have not established how old the clone is, and NASA cites a more cautious estimate of several thousand years, perhaps up to 14,000.
Is Pando really 80,000 years old?
No one has directly measured Pando’s age. The figure of 80,000 years appears in public-facing accounts, including the U.S. Fish and Wildlife Service’s aspen explainer. The Natural History Museum of Utah gives a range of 60,000 to 80,000 years. Neither figure is established as a direct measurement of Pando’s age in those accounts.
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The central difficulty is that researchers are trying to estimate the age of a clonal lineage, not date a surviving trunk. The Western Aspen Alliance at Utah State University says estimates based on the clone’s spread and past climate depend on too many assumptions to provide a reasonable data-based age. Genetic mutation data have not yet produced an age either. NASA’s Earth Observatory describes scientists’ estimate as several thousand years, possibly as long as 14,000 years, linked to the retreat of ice from the Fish Lake Valley. These are competing, uncertain estimates—not a settled age range.
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How can thousands of trees be one organism?
Quaking aspen can send up new shoots from underground roots. In a clone, those shoots share a genetic lineage; individual trunks can die while new ones grow. Pando’s name means “I spread,” a name given by researcher Michael Grant in 1992, according to the Natural History Museum of Utah.
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A 2008 genetic study tested whether the grove’s mapped boundary corresponded to one clone. Researchers analyzed 209 stems at seven microsatellite loci and identified a single genetic entity across about 43.6 hectares. They also found 40 other genotypes next to Pando, showing that the surrounding aspen stand is not all part of the same clone. The authors concluded, “We have identified a single genetic entity concurrent with that described from morphological characteristics.”
How old are Pando’s trunks?
The age of the clone is not the age of any one stem. NASA reports that Pando’s individual shoots typically persist for about 100 to 150 years before dying back, while replacement shoots grow from the root system. The lineage may therefore outlast many generations of trunks, even though its precise age remains unknown.
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How large is Pando, and is it the largest living organism?
NASA reports that Pando covers 106 acres (about 43 hectares), includes more than 40,000 trees, and has an estimated weight of 13 million pounds. The 2008 genetic study’s mapped area, 43.6 hectares, is consistent with the commonly cited acreage after rounding.
“Largest” depends on what is being measured and which organisms are being compared. Pando is often described as one of the largest or heaviest clonal trees, but the Utah Historical Society cautions that calling it the largest single living organism is not scientifically confirmed. Area, estimated mass, and taxonomic category are different ways to define the superlative; a claim about one does not automatically prove the others.
Is Pando in danger?
Researchers and historical sources have raised concerns about whether enough young shoots are establishing to replace older stems. NASA reports that field measurements and aerial photographs showed thinning since the 1930s. In research it cites, areas showing regrowth were fenced from deer and cattle. The Utah Historical Society also describes browsing by deer, elk, and livestock as a concern and reports promising rejuvenation in fenced enclosures.
These findings point to regeneration and browsing as important management issues, not to a single definitive diagnosis for every part of the grove. NASA quotes Utah State University ecologist Paul Rogers describing the imbalance this way: “If you think of Pando as a village, it’s a village full of old people with very few children growing up to take their place.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where is Pando, and can you visit?
Pando is in Fishlake National Forest in Utah. The Natural History Museum of Utah directs visitors to the U.S. Forest Service for access details, campground reservations, permits, current conditions, and fire alerts. Check the Forest Service’s Fishlake National Forest page before traveling; conditions and access information can change.
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