This visualization displays a heart disease dataset as an area chart, plotting age against resting blood pressure across the patient records. The chart uses D3 v7's `d3.area()` generator with linear scales for both axes, rendering an SVG path with a semi-transparent steelblue fill. The code loads data from a CSV file via `d3.csv()`, sorts records by age, and includes labeled x- and y-axes formatted with `d3.axisBottom()` and `d3.axisLeft()`.