Suppose that you had Alzheimer's...

[charles]

The trouble is that you have to be GIVEN the power of attorney - you can't just take it.

[harry]

It's a disease that creeps up slowly. You only realise with hindsight.

The clue is circular conversations. As time goes by, the circle becomes smaller. Finally reaches zero. After that, they can still go on for years.

There's some here might have it. The victim never realises.