In this Stay Young Special, we hear from Professor Andrew Steptoe, Head of Behavioural Science and Health at University College London, who leads the English Longitudinal Study of Ageing (ELSA).

We hear the top tips that Professor Steptoe swears by to keep youthful. How can having a sense of purpose keep you genetically young? Why can feeling younger make you physically youthful? And how can your social life keep you in your prime?

And as this is a Just One Thing special, we'll end each interview by asking Professor Steptoe for the one single most effective health hack to help you stay young.

Producer: Dom Byrne

Production Manager: Maria Simons

Exec Producer: Zoe Heron

Specially composed music by Richard Atkinson (Mcasso)

A BBC Studios production for BBC Sounds / BBC Radio 4.