How do I stay mentally sharp?

To stay mentally sharp after 40, keep your brain engaged with activities like reading, puzzles, or learning new skills. Stay socially active by connecting with friends or joining clubs. Regular physical exercise, especially cardio, helps boost brain function and reduce stress. Maintain a healthy diet with brain-boosting foods like leafy greens, fish, and nuts. Get enough sleep and practice stress management techniques like meditation or mindfulness. Consistency and challenge will keep your mind sharp as you age.