Give your ideas a chance. Pick an intellectual profession - and a smart mate. Intriguing studies from Poland suggest that people whose careers demand an exercise of intellect are more likely to sustain high levels of cognition in their lives. And marrying someone smart may provide you with ongoing stimulation. Expose yourself to multiple experiences.
Creativity often boils down to the ability to adapt solutions from one domain to another.
Learn from Leonardo. In his new book How to Think Like Leonard da Vinci, author Michael Gelb offers several brain-enriching strategies that worked for the ultimate Renaissance Man. As we age, we must consciously remind ourselves to put information into our memory banks. Listen to Mozart. This allows faster, integrated access to more information.