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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
There are more nerve cells in one human brain than there are stars in the Milky Way.
There are 60,000 miles of blood vessels in every adult human.