Everyone fears ageing. Now that life expectancy in the developed world is securely more than three score and ten, fear of imminent death has receded and been replaced by a dread of getting old. While the definition of old depends on the age a person has reached - during their 20s people worry about turning 30; during their 30s people worry about turning 40; in their 50s people fear turning 60 and becoming an old-age pensioner.
