How can you tell the exact age of a tree?

 

                    Every year as a tree grows it deposits a new layer of cells on the outside of its trunk, beneath the bark. This new layer is called an annual ring.

                   By counting the annual rings it is simple to work out the exact age of a tree, Even in the case of a living tree, it is possible to drill into the trunk and remove a sample in order to date the tree without causing any permanent damage.

Picture credit: google