This line chart visualizes the relationship between Age (in years) and Average Blood Sugar (mg/dL), where each point represents the mean blood sugar for a given age from a health dataset. A single steelblue path traces the trend across the sorted age values, with labeled axes and adjusted y-axis limits for clarity. Built with D3 v7, the code uses `d3.csv` to load external data, `d3.rollup` and `d3.mean` to compute aggregates, `d3.scaleLinear` for axes, and `d3.line` and `d3.axisBottom`/`d3.axisLeft` to render the SVG line and axes.