The idea of knowing you're going to get dementia sometime in the next decade is interesting. But I don't think it's straight-forward as to whether or not knowing is a good idea.
It's also a little amusing to take the idea to its logical extreme: What if it becomes a societal norm to know? Would public venues allow soon-to-be dementia patients line cutting priority etc? Think amusement parks, transit reservations, hotel booking, bars, movie theaters -- all of it. There could be a whole industry built overnight of catering to this specific demographic.
It's also a little amusing to take the idea to its logical extreme: What if it becomes a societal norm to know? Would public venues allow soon-to-be dementia patients line cutting priority etc? Think amusement parks, transit reservations, hotel booking, bars, movie theaters -- all of it. There could be a whole industry built overnight of catering to this specific demographic.