The Unwritten Code of Longevity Ethel Caterham's 117th birthday has sparked widespread interest in her remarkable life story.
At first glance, it's easy to get caught up in the sentimental appeal: this is a person who has lived through two world wars, seen monarchs come and go, and accumulated an astonishing number of experiences.
But as we gaze upon this extraordinary individual, it's worth asking what secrets she might hold that could inform our understanding of aging and longevity.