Which is the oldest living tree?

The oldest known individual living tree is a Great Basin bristlecone pine in the White Mountains of California, estimated to be over 4,800 years old — meaning it was already ancient when the Egyptian pyramids were relatively new. These gnarled, weather-beaten trees survive in harsh, high-altitude conditions that slow their growth and protect their dense wood from rot and pests. Some clonal organisms, where a root system sends up many trunks, are considered even older as a whole.