Redwoods are the tallest living trees, often exceeding 300 ft (90 m) in height. Nearly exterminated by the ice sheets of the glacial ages, redwoods are found only in a narrow strip near the Pacific coast of the northwest US. They take up to 500 years to reach maturity, and some are known to be more than 1,500 years old. As redwoods age, their lower limbs fall away, leaving a columnar trunk that can reach a diameter of more than 20 ft (6 m). What is the largest tree in the world? Discuss