What If you can fast but with difficulty?

Allah says… “And as for those who can fast with difficulty, (e.g. an old man), they have (a choice either to fast or) to feed a Miskeen (poor person) every day. But whoever does good of his own accord, it is better for him. And that you fast is better for you if only you know.” [al-Baqarah 2:183-184] Al-Bukhaari (4505) narrated that Ibn ‘Abbaas said: “This has not been abrogated. It refers to old men and old women who are not able to fast, so they should feed a poor person for each day.”