Thanks. That's a good question.
I think it depends on what's wrong with a person. If we go with Jocelyn's idea that we only have these for someone who's had a diagnosis, if somebody has had a diagnosis of dementia, then they probably need to redo this every year, because they will have decline every year, and I think it should be done.
If one didn't have the requirement for having a diagnosis, which I actually wouldn't rule out.... I think some people have a family history of very severe dementia, and they might want to indicate what they would wish at, say, a chronic vegetative state. That might be a very different thing. That might be a five-year thing, but once one has a chronically degenerative condition, very frequently.... It's even quicker if you have something like Creutzfeldt-Jakob disease, which is very fast and progressive. I think there are a lot of these very context-specific things that we have to think very hard about.
I don't think it's not doable, and I'm not saying that we shouldn't have advance requests; I'm just saying that we have to really think about this and think about the practicalities for those of us who are going to end up seeing someone walking around not knowing their family members but still enjoying life. How are we going to do this? Are we going to hold them down? I can't see any of us doing this.