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".
Joe Rogan talks NMN, Resveratrol and Longevity with Dr. David Sinclair - Very Educational Excellent Video!