A test could indicate whether people in their 40s are more likely to develop dementia later in life, scientists say. But wouldn't many of us rather not know? It is a devastating, heart-breaking, life-shattering condition - and one with an enormous impact not just on those who live with it, but on their loved ones too. Dementia robs from us our memories and our ability to think - the very brain functions that shape our sense of self.
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