This is a free preview of a paid episode. To hear more, visit www.louiseperry.co.ukMy guest today is Coleen T. Murphy, Professor of Molecular Biology at Princeton, and also the director of Princeton's Laboratory for Aging Research. Her new book is titled 'How We Age: The Science of Longevity.' We spoke about why women live longer than men, what centenarians seem to have in common with one another, why eunuchs may live longer than othe…