Healthy habits to keep your brain sharp and resilient as you ageAt one time or another, who of us has not misplaced our car keys or drawn a blank when trying to find the right word? For the most part, these experiences — known as tip-of-the-tongue phenomenon or lethologica — although undoubtedly frustrating, signal normal changes in our brains as we age. But when frequent memory loss, personality changes and mood disorders like depression come in to play, a more serious...