2022 Redwood Forest Calendar! The trees of the Redwood Forest are some of the oldest living things on Earth. The typical mature tree you would find there is anywhere from 800 to 1,500 years of age. Some of the oldest are estimated to be around 3,000 years old! With some trunks reaching diameters of 24 ft and heights of 370 ft, these trees are magical! Enjoy our tree wall calendar 2022.