At the late stage, typically people are getting slow in walking. They can fall. A lot of head trauma can happen during that period. At the late, late stage, what happens is that they become wheelchair-bound or bed-bound. They can get pressure sores from being on their backs for most of the day. That’s the typical progression.
However, there are people who don’t progress that way, meaning they’re ambulatory till the very end. What may get them in the end may be aspiration pneumonia, or something else altogether.