100-year-old sisters share 4 tips for staying mentally sharp as you age—and they don’t say crossword puzzles

Centenarian Ruth Sweedler has impressive recall and can make good conversation about what’s going on in the world. Over the years, strangers and family members alike have commented on it. 

“My doctor loves to talk to me,” Sweedler says. “He’d say, ‘You’re amazing.’ And I’d say, ‘Because I’m old?’ And he’d say, ‘No! Because you’re sophisticated.'”