what is the longest lifespan of a tree
It's a good thing Giant tortoises live as long as they do as they average only .25 MPH. As far as plants go, Bristlecone pines found in the White Mountains in California, have the longest life span of any plant or tree. One such pine named the Methuselah tree is estimated to be 4,725 years old. If you consider clams as animals and not just ingredients for soup then the quahog clam has quite an impressive life span. In 2007 scientists found a quahog clam off the north coast of Iceland which they believe to be 400 years old.
The oldest known blue oak is in Sequoia National Park and estimated to be about 400 years old. Deciduous oaks native to the eastern United States are also long-lived. White oak (Quercus alba) is the longest-lived, with an average life of 300 years and maximum life span of 600 years in USDA zones 3b through 8b. Southern red oak (Quercus falcata) grows in USDA zones 7 through 9 and reaches 275 years.