Morgan Levine, Ph.D., developed the phenotypic aging clock called PhenoAge and is a Founding Principal Investigator at Altos Labs, a biotech company that seeks to understand the mechanisms that drive the aging process and age-related diseases with the hope of identifying possible interventions. Additionally, Dr. Levine is an assistant professor of pathology at the Yale University School of Medicine, where her research focuses on the science of biological aging. Dr. Levine completed a postdoctoral fellowship with previous guest Dr. Steve Horvath, a pioneer in the field of epigenetic clocks.  In this episode, Dr. Levine and I discuss:  00:01:19 - What is aging and why does it matter to scientists? 00:04:45 - Hallmarks of aging 00:08:59 - The advantage of epigenetic clocks in research 00:19:05 - Epigenetic age acceleration 00:36:40 - Are epigenetic changes in aging a cause or consequence? 00:42:15 - Reversing epigenetic age with interrupted reprogramming techniques 00:49:27 - Therapeutic plasma exchange in aging and pro-aging factors in blood  00:56:01 - Lifestyle factors that accelerate epigenetic age 01:03:23 - Reliability of consumer epigenetic aging tests 01:06:12 - Construct validity of epigenetic clocks 01:12:06 - Thoughts on most exciting research in aging field  01:13:44 - Dr. Levine's lifestyle habits Get the show notes: foundmyfitness.com/episodes/morgan-levine Looking for more? Join over 300,000 people and get the latest distilled information on sleep, depression, and fasting straight to your inbox weekly: https://www.foundmyfitness.com/newsletter Try thirty days of our FoundMyFitness premium member to get access to exclusive episodes, emails, a live Q+A with Rhonda and more: https://www.foundmyfitness.com/trial