NEW You can now listen to Fox News articles! Top stories → Some 80-year-olds still have razor-sharp brains — and now scientists know why → One father's nightly bathroom habit was missed sign of common cancer → 5 ways to preserve vision as you age, according to an ophthalmologist SuperAger Ralph Rehbock sits with his wife in his home. (Shane Collins, Northwestern University) On the lookout → Heart disease threat projected to climb sharply for key demographic → Heavy snow is recipe for serious