How old is the oldest known tree in north America?

The oldest tree in the world is the called the Methuselah Tree and it is a Great Basin bristlecone pine (Pinus aristata var. longaeva, also called simply Pinus longaeva). This wind-blasted, gnarled tree is 4,767 years old, and is located in California's White Mountains. Careful study of growth rings from a core sample yielded the tree's age. There are dozens of other trees in the same general area which are almost as old. There are several trees in Patriarch Grove at the Ancient Bristlecone Pine Forest, but scientists have not actually publicized the exact identity of Methuselah, in an effort to protect it. Most of the bristlecone pine trees of this high-altitude grove, which is over 8,000 feet above sea level, are actually quite small and stunted, and appear to be just barely alive.

Source:business-services.upenn.edu