The founder of the Institute for Aging Research at the Albert Einstein College of Medicine, Nir Barzilai is one of the leading pioneers of longevity research and a proponent of regarding aging as a treatable disease, just like any other disease. Nir has a new book Age Later: Health Span, Life Span and the New Science of Longevity. He is a strong advocate for using Metformin and intermittent fasting as proven methods of extending health span and life span. The future of aging will be to erase it at a cellular level. We discuss how COVID has brought all this into focus and what the heck the COVID toe is that I had. Let's get into some science.