Exclusive: Prof Jim Al-Khalili says he will offer solution to ‘arrow of time’ problem in Royal Institution lectures

Tech billionaires attempting to live for ever are, quite literally, wasting their time, a leading physicist has said.

While some normal people are turning to unregulated peptide injections, cold plunges and supplements in an effort to defy ageing, the ultra-rich are aiming for immortality with even more drastic interventions: the tech chief executive Bryan Johnson has even tried injecting plasma from his 17-year-old son – although he later said he saw no benefit from it.