Fifty-year-old keith is informed by his doctor that his brain is showing signs of the initial development of neuritic plaques and a few neurofibrillary tangles. this is

normal

Explanation:

According to my research on studies conducted by medical professionals, I can say that based on the information provided within the question this is all normal. Since Keith is fifty years old, the information provided from the doctor is all normal. If Keith had many neurofibrillary tangles then he would most likely be diagnosed with Alzheimer, but this does not seem to be the case.

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