What is the ruling regarding the time limit imposed on a man unable to perform intercourse due to permanent factors?

Chapter on the Term for the Impotent and the Castrated who is not amputated

Al-Mughni

Book of Marriage

Book 35 · Issue 2 · Bab 4

Open in Qurani

Primary text

If the inability to perform intercourse is due to old age or an incurable illness, a time limit must be set for him. This ruling places him in the same category as one who was congenitally incapable of intercourse from creation.