“How is society going to support this silver tsunami?” he asks in an interview in The Sunday Times Magazine today.

“There’ll be a population of demented very old people, like an invasion of terrible immigrants, stinking out the restaurants and cafes and shops. I can imagine a sort of civil war between the old and the young in 10 or 15 years’ time.”

Amis, himself 60 and a grandfather, added: “There should be a booth on every corner where you could get a martini and a medal.”