Question :

What should a sick person, who is incapable of fasting, and who didn`t make up for missed fasting days, do?

The Answer :

One who has missed fasting days is obliged to make up for them, but if he/she wasn`t able to because of an incurable disease , or old age, then he/she has to pay a ransom which is feeding a needy person for each of the missed fasting days.