Is it prescribed to perform a voluntary Hajj on behalf of one who is unable due to old age or an illness from which recovery is not expected?

Question:
He says: Honorable Shaykh, may Allah grant you success, if a person is unable to perform Hajj due to old age or an illness from which recovery is not expected, is it prescribed for him to appoint someone to perform a voluntary Hajj on his behalf?

Answer:
No, this has not been reported except for the obligatory Hajj, for a living person. As for a deceased person, yes, a voluntary Hajj is performed on his behalf. A voluntary Hajj is performed on behalf of a deceased person if he had performed the obligatory Hajj, and the obligatory Hajj is performed on his behalf if he had not performed the obligatory Hajj. As for a living person, a voluntary Hajj is not performed on his behalf.