A new study has revealed that dementia reduced life expectancy by about two years for people with a diagnosis at age 85, 3-4 years with a diagnosis at age 80, and up to 13 years with a diagnosis at age 65.

A systematic review of the latest evidence in The BMJ (British Medical Journal) found that average life expectancy of people diagnosed with dementia ranges from 9 years at age 60 to 4.5 years at age 85 for women and from 6.5 to just over 2 years, respectively, in men.