The biggest living thing in America is a tree. So is the oldest living thing. Both are found in California.The oldest living tree is a bristlecone pine tree. Nickname"Methuselah," it is 4,700 years old."General Sherman" is the largest tree. It is a giant sequoia,standing 385 feet in height. It weighs over 1400 tons, more than the combined weight of 360 elephants.