The science of aging is rapidly evolving. Many of us are more aware of our capacity to live a long healthy life, than ever before. But the quest to understand human longevity – and perhaps figure out how we can slow down the process – is still a huge work-in-progress. Why do we age? Is it due to wear and tear on our bodies, is it all predetermined by our genes – or is there an invisible killer all around us, such as toxins in the environment, that is slowly eating away at our lifespan? These and many other compelling questions about aging are explored in a fascinating new book: Borrowed Time: The Science of How and Why We Age, by Sue Armstrong. In this episode of the Live long and Master Aging podcast, Sue, a writer and broadcaster based in Edinburgh, joins Peter Bowes to explore the latest research and the lessons to be learned from our growing understanding of what it means to grow old.