This is a picture of Yosemite National Park in California. The tree I'm standing next to are called sequioa trees. This tree is about 500 years old. They are the tallest and oldest trees in the world. The average height of giant sequoias 50-85 meters and 6-8 meters in diameter. The tallest one is 94.8 meters and over 17 meters in diameter. The oldest giant sequioa is 3,500 years old.