I can understand your being anxious about that. But I understand your DH as well. I feel such a fraud sitting at home as a perfectly fit (but deaf) 78-year-old. It appears the best I can do is nothing!
Having worked for the NHS for the best part of my working life if I was as quick now as I was then, I'd at least have helped during meal-times to free-up the nursing staff, but it would look like a re-run of Julie Walters's " Two Soups " Wouldn't work would it ?