London May 18: Drinking orange juice could help improve brain function in elderly people says a new study. The population is ageing rapidly across the world. Estimates suggest that the number of persons aged 60 or over could triple by 2100. It's therefore imperative that we explore simple cost-effective ways to improve cognitive function in old age said study co-author Daniel Lamport from the University of Reading. Read: Drink orange juice for increase in hemoglobinH The study saw a group of 37 healthy adults (mean age 67 years) consuming 500 ml of orange juice daily over an eight week period.