Several facilities offer specialized care. For example, Pacific Institution in Abbotsford has a palliative care program within the prison facility. They also have a peer support program. Some of the younger, healthier men care for some of the older, less healthy men. There has been some talk, or some rumblings, that perhaps that might be a model worth looking at replicating across the country, but people are moved as their needs shift and change.
I would again bring it up that when someone gets to the point where either they don't understand why they're in prison anymore because of dementia or they are incapable of harming themselves or anyone else, I would question why they're still in the prison system.