In his book How and Why We Age, Dr. Leonard Hayflick observes: “In 1900, 75 percent of the people in the United States died before they reached the age of sixty - five.
Raamatus „How and Why We Age ” märgib dr Leonard Hayflick:„ Aastal 1900 suri 75 protsenti USA elanikest enne 65 - aastaseks saamist.