Christine Clark, age 11,  Clyde; for her question:

How big is the oldest tree in the world

For many gears we thought that the world’s oldest tress were the giant sequoias of California; Many of them are known to be 2,000 and maybe 3,000 years old. But in 1958, a group of still older trees was discovered not far from the giant sequoias. They are the Bristlecone Pines which stand on the shoulders of the White Mountains, a range of the Sierra Nevada,

Many of these gnarled pines are more than 4,000 years old and at least one is 4,600 years old. A tree is always growing and adding new width to its trunk, so we would expect these old timers to be giants. They are not. Their gnarled trunks are very thick, but in height most of the old timers stand about as high as oak trees,