Target Band 9 · Original model answer
I would distinguish difficulty learning from difficulty making room for learning. A working parent may be perfectly capable of understanding a new skill but have no uninterrupted time to practise it. There is also the discomfort of losing the competence we take for granted: an experienced professional suddenly becomes the person who needs everything explained. Neither barrier means adults cannot learn; it means the pace and conditions of learning matter. Short, practical sessions may be more effective for them than a demanding course that assumes plenty of spare time.