PROJECT SUMMARY/ABSTRACT This competitive renewal is to continue the Aging and Development Training program in the Department of Psychological & Brain Sciences at Washington University. As the population of the US and many other countries shifts toward an older distribution, the scientific and societal challenges of human aging continue to increase. There is a critical need for researchers with a firm foundation of training in the behavioral and psychological characteristics of aging, and for these researchers to have the cutting- edge skills to integrate neurobiology, genetics, and socioemotional mechanisms of aging into their work. This renewal builds on the program's unique role as a pipeline of aging researchers with a rigorous training in psychological science, while building transdisciplinary bridges. With this renewal a core group of 20 Faculty in the Department are joined by 13 faculty with primary appointments in the Medical School, the Brown School of Social Work, and the McKelvey School of Engineering to serve as program mentors. Training is organized around four interrelated themes: cognitive changes in aging, the cognitive neuroscience of aging and dementia, personality and socio- emotional aging, and translational impact. Trainees will receive in-depth training in one to two themes and broad exposure to the others. The program trains both clinical and non-clinical PhD students, and postdoctoral fellows. Trainees benefit from the excellent resources in the Department and across the University, including those of the Charles and Joanne Knight Alzheimer Disease Research Center and the Harvey A. Friedman Center for Aging. In this proposal we document the high quality of the program trainees and faculty, the structure of its well-established training program and its assessment, and the program's track record of success.