What does a doctor's age have to do with mortality risk?

Patients treated by older doctors are more likely to die than those with younger doctors, according to Harvard researchers.

Their observational study of 737,537 US hospital patients and the 18,854 doctors who treated them has found that those seen by a doctor over 60 have a higher chance of dying within the next 30 days than if they are treated by a doctor under 40.

The researchers have worked out that if 77 hospital patients are seen by an older doctor, there will be