The prostate gland is about the size and shape of a walnut, just below a man’s bladder. For such a small item it causes problems for a large number of men. Fortunately most prostate problems are more annoying than dangerous.

According to the Alzheimer’s Association, since 1980 the number of Americans with Alzheimer’s disease (AD) has more than doubled, to 4.5 million.

Age is still the key factor in AD’s onset. One in ten individuals over age 65 and nearly half those age 85-plus are affected. Barring an effective treatment, that number is expected to rise as the baby boomers age—to as high as 16 million citizens by the year 2050.