Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: "This verse is not abrogated. He used to recite it as yutawwaqunahu (those for whom it is made a heavy burden). It concerns the very old man who is obliged to fast but is not able to, so he does not fast and gives the fidyah (compensation)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11804