With Baby-Boomers now reaching retirement age, the US (and Florida in particular) will have a large segment of its population with distinctive accessibility needs. From securing healthy food to obtaining medical care, as well as simply remaining socially connected to family and friends in their communities, transportation systems have a critical role to play in ensuring our aging population can safely and efficiently reach desired destinations. In this project our key objective is to develop context-specific multimodal modeling and measurement approaches that can be used to assess aging populations' accessibility to essential goods and services. This study will conduct two in-depth literature reviews: one for research that focuses on the research trends in accessibility modeling and then another that focuses on travel behavior and accessibility needs of aging populations. In the latter case, we plan to collect qualitative data and analysis to fill in any gaps we find in the existing literature. We will then combine these two lines of research into a modeling framework that will allow for accessibility measures that are specifically tailored to aging populations. The resulting accessibility metrics will allow us to evaluate how well different modes of transportation equitably serve the needs of the senior populations. We will test the analytical capabilities of our accessibility metrics using Leon County, FL as a case study.