In 2013, a team at Harvard successfully showed, that aspects of the aging process may be reversible! They treated old mice with a compound called NMN (NICOTINAMIDE MONONUCLEOTIDE), a direct precursor supplement to NAD+. Remarkably, after only 10 days of treatment, key biological markers used to measure the aging process, resembled those of much younger mice. It was the human equivalent of a 60-year old, with some biomarkers reversed to resemble those of a 20-year old. Check out this article at Harvard Medical School, this is not science fiction "A New—and Reversible—Cause of Aging".