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Notes:
If we are interested in unexpected physical problems that occur with age, and that can cause incapacitation, two are very important.
More than half of men and women die of cardiovascular disease, and every year 6 to 12 of us die while piloting airplanes. This is not trivial to the folks living in the houses below, nor to the passengers and the heirs.
Senility is not common, but is important because it sneaks up on us unawares, and may be too subtle to notice.
The two main causes of senility are Alzheimer-type dementia and multi-infarct dementia (due to sick blood vessels).