A leading authority on aging wrote: “After performing the miracles that take us from conception to birth and then to sexual maturation and adulthood, nature chose not to devise what would seem to be a more elementary mechanism to simply maintain those miracles forever. ”
हम बूढ़े क्यों होते हैं इस पर अध्ययन करनेवाले एक विद्वान ने लिखा: “कुदरत ने इंसान की रचना करते वक्‍त बड़े - बड़े करिश्‍मे किए हैं ।