The leadership of one who is unable to prostrate if he uses a chair

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: My father has been the imam of a mosque for more than thirty years, and he is still the imam of the mosque. This mosque is located in an area of rest houses and farms outside the city. He says his age has now advanced, and he is over eighty years old. Prostration has become difficult for him and burdensome, and usually only laborers pray with him. The question is: Is it permissible for him to use a chair for prostration only, and serve as imam?

Answer:
No, no, it is not permissible, it is not permissible. This is because he is unable to perform one of the pillars of the prayer, which is prostration on the ground. Therefore, he does not lead people in prayer, and the prayer behind one who is unable to perform a pillar is not valid. The jurists mentioned this: he is unable to perform one of the pillars of the prayer. Yes. Let someone else lead them who is able to prostrate on the ground. Yes.