Americans born in the 1960s and early 1970s report higher loneliness and depressive symptoms, and show poorer memory and physical strength, than earlier generations. Such declines are largely absent in peer countries, particularly in Nordic Europe, where outcomes have improved over time.In a new study, psychologist Frank Infurna of Arizona State University and co-authors analyzed survey data from 17 countries seeking to identify why U.S. trends diverge from other wealthy nations.