What is the longest-lived tree species?

The longest-lived tree species is the bristlecone pine (Pinus longaeva), which can live for over 5,000 years. These trees are found in the White Mountains of California, USA. The oldest known bristlecone pine, named Methuselah, is estimated to be around 4,800 years old. The extreme longevity of these trees is due to their slow growth, harsh environment, and the protection they receive from their gnarled, weather-resistant wood.