This dashboard visualizes employee salary trends by age using two synchronized SVG charts. The first chart displays multi-series lines for average, minimum, and maximum salaries, while the second combines bars for employee counts with an overlaid line for average salary. Built with D3.js v7, the visualization loads CSV data, groups records by age, and uses `d3.rollups` for aggregation, `d3.line` for path generation, and `d3.axisBottom`/`d3.axisLeft` for scales and axes. Gridlines and legends are rendered programmatically, with salary values parsed from formatted strings.