‘Am I 68? 69?’ Irvine Welsh on growing old, getting clean, bashing out his new novel – and flirting with guns

Three decades after he channelled his heroin addiction into the cult classic Trainspotting, the Scottish author has discovered the joys of yoga, breathwork and standing desks. But is he quite as ‘Zen’ as he claims? By rights, Irvine Welsh ought to be photographed somewhere gritty, looking grumpy, he says: “That’s the brand.” Beside a graffitied wall or at the docks, with a beanie pulled low, and definitely not smiling. But here he is, clear-skinned and wholesome in shorts and a T-shirt, drink...

By Paula Cocozza