The Ancient Bristlecone Pine Forest... This National preserve holds the worlds oldest living thing, Methuselah. A living tree that dates back to before Genghis Kahn was terrorizing the world. It is estimated to be around 5000 years old and still living. The tree in the image may or may not be Methuselah. The park service will not identify the actual tree, just that it resides in this tine reserve at 10,000 ft elevation..