Question: My paternal grandmother asked me to send this question to you, in which she says:
Forty years ago, I gave birth to a baby girl during the blessed month of Ramadaan, and I have not made up for the days on which I broke my fast until now, due to my being preoccupied with worldly affairs and my ignorance of religious matters. When I came to know about religious matters and obligations, I realized my shortcoming for not making up for the days on which I broke my fast. Now I am about eighty years old and I enjoy good health.
My question is: Is it permissible for me to make up for the fast of that month after such long period or not? If yes, should I only fast or combine the fast with feeding? And in case I should do both, should the feeding be at the end of every day I fast or to be done collectively at the end of the month?
Answer: Your grandmother should make up for the days on which she broke her fast during Ramadaan, and seek Forgiveness of Allaah (Exalted be He). She should also feed a poor person in compensation for every day she misses fasting, by giving out about half Saa` (1 Saa` = 3 kg. Approx.) of the staple food of the country, due to her negligence of making up for the fast. It is permissible for her to feed the needy before or after fasting, jointly or separately, even if it is all given to one poor person… read more here.