ABSTRACT This workshop will be the first meeting to bring together multidisciplinary perspectives—including thought leaders in microsimulation, health economics, demography, health care reimbursement, health policy, decision analysis, and aging research—to discuss the application of microsimulation to address a range of topics in aging, including the impact of policies on the aging population. It will be a companion meeting held in the United States to the 8th World Congress of the International Microsimulation Association, and will be unique by focusing solely on the application of microsimulation to topics in aging. In addition to uniting aging researchers across multiple disciplines with domestic and international experts in microsimulation, our workshop will emphasize the inclusion of National Institute on Aging (NIA) investigators and trainees to expose this community to the utility and value of microsimulation. The workshop will have the following four aims: 1) Unite established and young investigators across multiple disciplines to discuss the application of microsimulation to address a broad range of salient topics in aging, identify gaps in knowledge that could be resolved using microsimulation, and identify barriers to its implementation and advancement. In doing so, we will build-out existing microsimulation models and expand the user base, thereby increasing the capacity and power of models and enabling them to more effectively guide the development of policies impacting older adults. 2) Engage the aging research community in the United States, especially NIA investigators and trainees, and increase their representation in the field of microsimulation. This will expose current and future leaders in aging research to the capacity and benefits of microsimulation, promote collaborations among the NIA research community, and encourage the application of microsimulation to existing NIA data sets (e.g., the Health and Retirement Study and its sister surveys from around the world) to generate new and innovative insights. 3) Develop a strategic action plan to set priorities for future studies. This plan will summarize workshop presentations and conclusions and provide a framework for future studies to expand on these findings and enhance the utility and capacity of dynamic microsimulation models. 4) Develop a Young Investigator Program to motivate a diverse group of students and young investigators to pursue careers in microsimulation and aging research. Our Program will allow for collaborative networking and exchange of knowledge and ideas among young and established investigators, with the goal of encouraging young investigators to pursue research careers related to microsimulation and aging, and ultimately submit grant proposals to NIA solicitations and contribute to the scientific literature. Through talks, sessions, and discussions, our workshop will expand the use of dynamic microsimulation models among the aging research community in t...