I think that should be at least enough for parents know that this game is not for kids. Once you have the tree's diameter, look up the growth factor for the type of tree you're measuring, which is how much width it gains annually. But you have to confirm your age to view the game site in the steam shop. Recent Reviews: Very Positive (199) - 81% of the 199 user reviews in the last 30 days are positive. To determine the age of a tree, first find its diameter by measuring the circumference of the trunk in inches and then dividing that number by pi. Uncover artifacts from the son's life as he becomes intertwined in the fox’s journey towards The First Tree. The First Tree - From the creator of Home is Where One Starts… comes The First Tree, a third-person exploration game centered around two parallel stories: a fox trying to find her missing family, and a son reconnecting with his father in Alaska. I think ratings like Pegi are only available for final games and not early access games that can still change a lot. FAR FROM THE TREE is a documentary based on writer Andrew Solomon's best-selling nonfiction book Far from the Tree: Parents, Children and the Search for Identity. The most accurate way foresters determine the age of a tree is by counting the growth rings of a severed tree stump or by taking a core sample using an increment borer. Finally, divide the circumference by the average annual growth rate to determine the tree's age. However, it is not always appropriate or practical to use these invasive methods to age a tree.