Mounting evidence consistently demonstrates the relationship between social engagement and higher levels of physical, mental, and cognitive functioning and its association with longer life spans. By contrast, socially isolated individuals face health risks comparable to those of smokers. Their mortality risk is twice that of obese individuals. Over the past 50 years, Americans’ living patterns have changed dramatically. In 1970, a married couple with young children represented the most common living arrangement. Forty percent of households reflected this “traditional” family constellation. By 2014, fewer than 20 percent of households were comprised of this traditional mix. Rather, 58 percent of households today are occupied by unmarried adults or couples without children. The social engagement index shown below summarizes nine metrics characterizing two types of activities critical to social engagement: meaningful relationships and group involvement.