Neurofibromatosis has no age of onset, because neurofibromatosis is actually an abnormal proliferation of the sheath outside the nerve, which can develop anytime and anywhere, only that it grows to a certain extent and presses on the surrounding brain tissue, thus causing various clinical symptoms and leading to the discovery of neurofibromatosis. There is no specific age at which neurofibromas may develop; it is a process that can occur at any time, and some children may even have neurofibromas when they are first born. It is also important to make a distinction between neurofibromas and neurofibromatosis. Neurofibromatosis is a genetic disease, and often the child’s entire body may be covered with tumors by the time he or she is a few years old, as long as there are nerves.