|A Great Basin bristlecone pine (Pinus longaeva) in the White Mountains of California|
|New growth in a bristlecone|
Another very old bristlecone, by the name of Prometheus, which was cut down in 1964, was 4900 years old. The study of this tree led to great advances in the understanding of such things as carbon dating. If it had been left standing, it would surely be the oldest known bristlecone. Still, it is quite possible that there are older P. longaeva out there that have not yet been identified.
Source is the National Park Service. Images are from Wikimedia Commons and are either under a creative commons license or are copyright free: one, two