Bristlecone pine Totally Explained

The bristlecone pines are a small group of pine trees (Family Pinaceae, genus Pinus, subsection Balfourianae) that can reach an age far greater than that of any other single living organism known, up to nearly 5,000 years.
There are three closely related species of bristlecone pine:

Rocky Mountains Bristlecone Pine Pinus aristata in Colorado, New Mexico and Arizona
Great Basin Bristlecone Pine Pinus longaeva in Utah, Nevada and eastern California
Foxtail Pine Pinus balfouriana in California

Bristlecone pines grow in isolated groves at and just below the tree line. Because of cold temperatures, dry soils, high winds, and short growing seasons, the trees grow very slowly. The wood is very dense and resinous, and thus resistant to invasion by insects, fungi, and other potential pests. As the tree ages, much of its vascular cambium layer may die, in very old specimens often leaving only a narrow strip of living tissue to connect the roots to the handful of live branches.

Oldest living organisms

The oldest single living organisms known are bristlecone pines, though some plants such as creosote bush or aspen form clonal colonies that may be many times older. The existing growth in clonal colonies sprang as shoots from older growth so there's an unbroken chain of life that sometimes dates back several tens of thousands of years. However, the original ancient growth in these colonies is long dead. The oldest bristlecone pines are single plants that have been alive for a little less than 5,000 years. These very old trees are of great importance in dendrochronology or tree-ring dating.

Methuselah Currently, the oldest (acknowledged) living organism known is a bristlecone pine tree nicknamed "Methuselah" (after Methuselah, the longest-lived person in the Bible), located in the Ancient Bristlecone Pine Forest in the White Mountains of eastern California, and measured by core samples to be 4,789 years old. The U.S. Forest Service doesn't reveal the actual position of "Methuselah" in the bristlecone grove, in order to protect the tree.
The other two species, Pinus balfouriana and Pinus aristata are also long-lived, though not to the extreme extent of P. longaeva; specimens of both have been measured or estimated to be up to 3,000 years old. It is rumored that a specimen older than "Methuselah" has been discovered, but this hasn't been widely publicized.

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