The problem with this is that later on in life the child that got the tattoo will grow up and have children of their own, who will also want to get a tattoo or other means of expression done on their body. The teenager who is now a parent will most likely tell them no, but just like they did when they were younger, their children will also still probably go out and get a tattoo. How is the parent going to explain that it is not the right time for it, if they themselves got one also at that age?