I would go with Stillstandings suggestion, shortly after getting my FI ticket I got handed a student into his 60s, he had gone through many instructors and been recommended to give it up by all of them as he had been struggling with circuits for many hours, he said he was enjoying the flying and it did not really matter if he did not get to the licence but he wanted to continue. I changed the lesson plan and instead of bashing the circuit all the time we would head off locally and do general handling of all types then finish each session with just 2 or 3 circuits, the deputy CFI was amazed when I asked her to fly with him and told her she would send him solo - he finally got his PPL with about 65 hours.
