This stacked area chart displays the distribution of employees across three roles—Engineer, Project Management, and Finance—by age. The visualization uses d3.csv to load data from a remote gist, d3.rollups to aggregate counts, and d3.stack with d3.area to render the stacked regions. Axes are generated via d3.axisBottom and d3.axisLeft, with a d3.scaleOrdinal color scale and a custom legend. The SVG output highlights employee demographics as a function of age in a selected subset of job categories.