This area chart, built with D3 v6, visualizes the relationship between sleep hours and age for a small dataset of five individuals. The graphic displays sleep hours on the x-axis and age on the y-axis, using a filled gray area rendered as an SVG path with opacity. The chart employs `d3.scaleLinear` for both axes, `d3.area` with `d3.curveMonotoneX` for the smoothed area, and `d3.axisBottom` and `d3.axisLeft` to generate the axes. The data is hardcoded within the script, and the visualization is rendered directly into the SVG element.