Are you wondering how old your tree is? As far as trees goes the general rule is the thicker it is, that is the wider the diameter, the older the tree. Why is this a rule when it comes to judging the age of trees? It is a standard for determining how many years your tree has been around because every year your tree goes through a growth cycle and also a cycle of discarding the material that which it no longer needs. since most trees are not active when moving around the cells they discarded just stick on the outside of them. While this sounds gross it is the reason why when a tree is cut down, that oftentimes there are circles on the face of the stump. sometimes these circles are alternating dark and light shades the lighter shades are the ones that are still around and the darker shades are the cells that have died. this is why the age of a tree can be judged by how many rings it has on the face of the stump. the more rings that has, the more years it has been in existence.