| Person | Type | Job | Role(s) |
|---|---|---|---|
 Aidan Laverty | Crew | Editing | Editor |
Laura Davey | Crew | Production | Production Executive |
Emma Chapman | Crew | Production | Production Coordinator |
Marie O'Donnnell | Crew | Production | Production Manager |
 Michael Mosley | Cast | Actor | Self / Presenter / Journalist |
Krista A. Varaday | Cast | Self / Professor of Nutrition, University of Illinois Chicago | |
Clare Mosley | Cast | Self / Wife / General Practitioner / Consultant | |
Valter Longo | Cast | Self / Professor, USC | |
Joe Cordell | Cast | Self / Calorie Restrictor on Optimal Nutrition (CRONy) | |
 Fauja Singh | Cast | Actor | Self / 100+ year old marathon runner |
Luigi Fontana | Cast | Self / Professor, Washington University School of Medicine | |
Mark P. Mattson | Cast | Self / Professor, National Institute on Aging | |
| Person | Type | Job | Role(s) |
