New research has linked castration and sterilisation to increased life expectancy

An Otago University led study of 117 different mammal species, including humans, found an increased lifespan of about 10 to 20 percent higher in castrated male and females.

Lead author Mike Garrett says it bolsters earlier research which found a similar trend in insects.

He says the study supports arguments around the evolutionary benefits of menopause.

Garrett says menopause provides survival benefits through less focus on reproduction and a greater focus on taking care of younger people.