The goal of this work is calculate the age of a tree without cutting it.                                                                                                                                                                                                                                   After a search on the Internet, I found out that there were several ways to reach this purpose. In order to follow the way that I thought was the best one, the diametre of the tree's trunk had to be measured at the height of 1,5 metres from the ground. Then the diametre had to be divided ofr the growth factor of the species that the tree belongs to. Unfortunatley, I couldn't find it, so I had to use the general growth factor of the trees, which is 2,5 centimetres per year. Doing this calculation, it was discovered that the tree is 77 years old.                                                                                                                                                                                                   For this work, also the distance, between the tree and my house, had to be taken in consideration. Calculated with Google Earth, the tree was found out to be 67 metres far from my house.                                                         In conclusion, I have to say that using the general growth factor allows to calculate a very aproximatley age, because it doesn't take count of some factors that can influence the growth of the tree.