The wisdom teeth, also known as the third molars, emerge in the late teen years or early '20s. Typically, wisdom teeth extractions are recommended between the ages of 18 and the early 20s. This is because the roots and bone of the teeth are softer, making them easier to remove.
Generally, it is more difficult to take out teeth in adults when the bones are much harder than in teenagers, so earlier removal of wisdom teeth will make the work of your dentist lots easier.