Alastair Campbell co-hosts the UK’s most successful podcast, The Rest is Politics and a huge percentage of the audience is under thirty. He tells Katherine why he thinks he still appeals to the young.

He’s 68 but he’s hoping his biological age will be 21. If it’s not, he’s calling for a recount or an overhaul of the system!

His kids keep him feeling young, but Alastair says it can be challenging being the oldest man in the audience when he’s watching his comedian daughter Grace perform her often explicit set.

He lives a healthy life now but will colitis, stress and past struggles with depression and alcoholism have impacted on his biological age?

Dr Nichola Conlon gives her verdict on Alastair’s result and applauds his commitment to cold water swimming. She explains what happens to the body when you plunge in cold water, and how long you need to be in cold water per week to get the health benefits.

If you want an explainer on how UK politics work, the books Why Politics Matter and Alastair Campbell Talks Politics are available now

Alastair Campbell recorded this before he turned 68.

Lead producer– Henrietta Harrison

Social media - Cassidy Rebelo

Video Producer – Elena Cotton

Video Producer– David May

Artwork – Ben Watkins

Video Editor - Paul Collins-Reddin

Head of Video – Edie Jefferys

Sound Designer – Dominic Delargy

Executive Producer – Mick Coyle

Chief CreatIve Officer – Lucie Cave