(1) Prelingual deafness should not exceed 7 years old, because after 7 years old, people's hearing and speech centers basically stop developing, and the effect of cochlear implant is poor. Many people can only listen to sounds, and they won't have a language experience!

(2) Cochlear implants in children were reported as early as 8 months. If it is too small, the child's skull development may affect the operation. In addition, cochlear implant is completed under general anesthesia, and anesthesia intubation is difficult!

(3) There is no age limit for post-lingual deafness, and elderly deaf patients can also have cochlear implants, provided that the general condition, especially the cardiovascular and cerebrovascular functions and lung functions, can tolerate general anesthesia and surgery!