The secret to living longer and healthier

It's part of the human condition, and there's no running away from it... we're all ageing, but some of us might feel we're ageing at a more accelerated rate than others. Why do some people appear to be more resilient to ageing, while others seem to be much older than their years? Regius Professor, Rose Anne Kenny, author of ''Age Proof'' and Head of the ageing research programme at Trinity College Dublin talks to Mark Leishman on Nights.