This example shows an area chart of age versus height, with the area filled in a solid blue color beneath the line. It uses D3 v7 to load a CSV file from a GitHub gist, parse the data, and sort the entries by age in ascending order. The visualization defines linear scales for both axes and uses the `d3.area` generator to create the filled path, while `d3.axisBottom` and `d3.axisLeft` render the axes with labels. The SVG rendering is sized to 600 by 400 pixels, with a slightly filtered fill color applied to the area path.