Many retirement developments serve as a tranquil refuge for older people who can no longer traveling to faraway places or engaging in bold adventures. But residents of hundreds of senior living communities can return to their days of wanderlust and thrill-seeking when staff members schedule a date for them to take turns donning virtual reality headsets. The headsets may transport them to Europe, immerse them in the ocean depths or soar them on hang-gliding expeditions while they sit by each other. Although VR can be isolating, a Massachusetts company has turned the technology into a catalyst for better cognition and social connections in 800 retirement communities in the United States and Canada.