<Ul> <Li> High level of education </Li> <Li> Physical exercise </Li> <Li> Staying intellectually engaged, i.e. reading and mental activities (such as crossword puzzles) </Li> <Li> Maintaining social and friendship networks </Li> <Li> Maintaining a healthy diet, including omega - 3 fatty acids, and protective antioxidants . </Li> </Ul> <Li> High level of education </Li> <Li> Staying intellectually engaged, i.e. reading and mental activities (such as crossword puzzles) </Li> <Li> Maintaining social and friendship networks </Li>

Which is the least likely occurrence in the aging brain