This area chart visualizes the relationship between age and weight using a green filled path. The data is loaded from a remote CSV file via `d3.text` and parsed with `d3.csvParse`, then sorted by age. The chart uses `d3.scaleLinear`, `d3.extent`, `d3.area`, `d3.axisBottom`, and `d3.axisLeft` to build the SVG rendering, with axes labeled "Age" and "Weight (kg)" and a title. The visualization employs a standard margin-based layout with a 600×400 SVG canvas.