Our population is growing older. Major investments in public health, sanitation, and therapeutics added nearly 30 years of life expectancy in the 20th century. When coupled with lower birth rates, this increase has led to the expectation that the proportion of older persons in the population (by convention, those aged 65 and older) will reach 20% by midway through the 21st century. Moreover, the older population itself is growing older, with people aged 85 and older representing the fastest growing segment. The same dynamic that has resulted in this remarkable growth of the older population in general has also contributed to the increase in prevalence of chronic conditions, leading to the worldwide pandemic of chronic disease and disability forecast by the psychiatric epidemiologist Ernest Gruenberg (1) three decades ago.