The present review presents the field of aging decision neuroscience, 20 years after the inception of this subfield. We begin with a historical overview of the area of study and highlight some current neural models of decision-making in aging. Typical changes to the brain that accompany aging are described, followed by a review of current lines of research that have advanced our understanding of how decision-making is impacted by advancing age. Four main areas of study are reviewed. First, we cover research on the dopamine system and feedback-based learning. Next, we review research on value integration and memory, followed by temporal discounting. We close out the literature review with discussion of studies in the area of social decision-making and its implications for understanding exploitation in aging. Finally, we end with conclusions and future directions that are likely to significantly advance the field over the next 20 years.