
The oldest documented living tree is a Great Basin bristlecone pine in the White Mountains of eastern California. It is more than 4,700 years old. A collection of bristlecone pines on Wheeler Peak in eastern Nevada is known to contain several trees over 3,000 years old, with one thought to be about 5,000 years old.
Sources:
"bristlecone pine." Encyclopædia Britannica. Encyclopædia Britannica Online School Edition. Encyclopædia Britannica, 2010. Web. 23 Sept. 2010 <http://school.eb.com.au/eb/article-9016487>.
Sprugel, Douglas G. "Bristlecone pine." World Book Student. World Book, 2010. Web. 23 Sept. 2010.
http://en.wikipedia.org/wiki/Bristlecone_pine