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Also, expanding on dementia: Who you are are your memories, and knowledge about the world and of course about yourself. So consider the following.
One day people you love will pass away. You must have experienced it already. And all you have left is knowledge this person existed. All the physical possession are just a reminders. But now, dementia takes it away from you. Memory of this person existing in the first place. All those photographs mean nothing, you don't know who is on them. They are gone, its like never existed for you.
This applies to yourself too. Remember that one cool trip you had? A cool party? Watching Pomu? Its gone. You don't have it anymore. Events that have shaped you, they are gone. You fell in love with her? Did it shape you? Its gone. And now this "shaping" is gone. You lost a part of yourself.
Think about this. We always at east have ourselves, what we made of ourselves. Nobody can take that. But dementia.
And then there is how other people perceive you. Once you are dementia ridden, your medical condition will determine how people approach you, what they think of you. Your sickness overrides everything. You are "A crazy and confused old Man", "that patient" etc. Death of self in the eyes of others.