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You can always do all the healthy living things like eating right and exercising that diminish risks of dementia for everyone. Actual single gene causes of dementia are very rare - they do exist like CADASIL, Huntington's and some forms of ALS, and genetic risk factors may run in families, but if knowing would help you plan better or better still reduce your risks, then sure it would be great to know exactly.
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It scares me too much. My paternal grandfather died of what was called hardening of the arteries of the brain which was probably Alzheimers. Mom has it now, but she is 100. I'm not sure I want to know, but then again, it would help me plan. But, if you know the future, will it affect the quality of life from then on? Hard to tell.
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yes dementia is largely hereditary.
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I know what you mean, it makes me wonder if I will develop whatever health issues that are plaguing my parents who are in the 90's. Then I stopped to think, I doubt I would even reach their age because of health issues I have now that neither of my parents ever had.

Methink it is all just the toss of the dice as to whether we will get whatever health issues our parents have.
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