It's never too late to start eating better, losing weight and exercising, studies find
Common sense and caution guarantee outdoor fun stays healthy, expert says
Fewer than 5 percent of healthy Americans who could donate blood actually do so each year, according to the American Association of Blood Banks. The average donor is a college-educated white male, between the ages of 30 and 50, who is married and has an above-average income. On average, 38,000 units of red blood cells are needed each day in the United States for trauma victims, heart surgery, organ transplants and patients receiving treatment for leukemia, cancer or other diseases.