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The Oldest Living Things on Earth

Some of the oldest living things on Earth are still alive right now, and a few of them are far stranger — and far older — than most people expect.

Methuselah, the ~4,850-year-old bristlecone pine

A Great Basin bristlecone pine in California’s White Mountains, nicknamed Methuselah, is estimated at around 4,850+ years old based on core samples and tree-ring counts, making it one of the oldest known individual, non-clonal trees on Earth. Its exact location is kept undisclosed to protect it from damage.

Bristlecone pines as a species are exceptionally long-lived

Beyond Methuselah, Great Basin bristlecone pines as a species are known for extreme longevity, partly attributed to the harsh, high-altitude, slow-growth conditions they typically grow in, which produces extremely dense wood resistant to rot, insects, and fungal decay.

Pando: a single aspen root system estimated at up to 80,000 years old

Pando is a quaking aspen colony in Utah made up of thousands of genetically identical trunks that all share one connected root system, making it arguably a single organism. Age estimates for Pando vary widely, from several thousand to as much as 80,000 years, since dating a clonal root system is far less precise than counting rings in a single trunk.

Clonal colonies complicate the definition of “oldest”

Whether something like Pando counts as the “oldest living thing” depends on how you define an individual organism — a single continuous root system versus a single, separately rooted trunk. This is a genuine scientific and philosophical debate, not just a matter of measurement, which is part of why different sources rank the “oldest” organisms differently.

The Greenland shark: possibly the longest-lived vertebrate

Using radiocarbon dating of proteins in the eye lens, researchers have estimated some Greenland sharks to be several hundred years old, with the oldest estimates exceeding 400 years, making it a strong candidate for the longest-lived vertebrate species known.

Ocean quahog clams: centuries-old shellfish

This deep-sea clam species can live for several centuries, with growth rings in the shell — similar in principle to tree rings — used to estimate age. One individual, nicknamed “Ming” after the Chinese dynasty during which it was born, was dated to roughly 500 years old.

How scientists determine the age of very old trees

Dendrochronology, the study of tree rings, is the main method for aging trees like bristlecone pines — each ring typically represents one year of growth, so a core sample drilled into the trunk can be counted like a timeline without cutting the tree down. This method is highly reliable for single, continuously growing trunks, but it does not work the same way for clonal organisms like Pando, where the visible trunks are relatively young even if the shared root system underneath is ancient.

What actually counts as “one organism” is a genuinely open question

A clonal colony like Pando raises a real definitional problem: every trunk is genetically identical and physically connected underground, but each trunk also grows, ages, and dies somewhat independently above ground. Because of this, published age estimates for organisms like Pando carry substantial uncertainty and should be read as informed estimates rather than precisely measured facts.

Frequently Asked Questions

Is Pando definitely older than Methuselah?

Not definitively. Pando’s estimated age range is wide and less precisely measured than Methuselah’s tree-ring-based estimate, so while Pando is very likely the older (or at least the more massive) organism by most estimates, exact comparisons carry real uncertainty on Pando’s side.

Why don’t scientists know the exact age of some of these organisms?

Precise aging generally requires a continuous, countable record, like tree rings or shell growth layers. Clonal organisms, deep-sea creatures, and anything without a clear annual growth marker are much harder to date precisely, so scientists rely on indirect methods like genetic mutation rates or radiocarbon dating, which come with wider margins of error.