Many older adults are affected by dementia. Up to 70% of dementia cases are Alzheimer's-related. It's degenerative disease that causes rapid cell death, in the brain. The loss in memory is caused by decrease of brain volume. Miranda shows no signs of Alzheimer's, or any other form of dementia. She seems to have great mental health, for a woman her age.
Age-Adjusted Alzheimer's Death Rate Compared With National Average