We might think we know what ageing is, but it’s surprisingly difficult to pin down. In this album a 70-year-old fashion model and her 17-year-old grand-daughter take part in a series of scientific tests to see whether it is possible to distinguish between them. The results give an insight into what contemporary science can tell us about what happens at the molecular, genetic, cellular, physiological and psychological level during the ageing process. This material forms part of The Open University course SD805 Issues in brain and behaviour.