This scatter plot visualizes the relationship between age and monthly income for a dataset of individuals. Each point is a person, with steel blue circles encoded by linear scales for the x (age) and y (monthly income) axes. The chart uses D3 v7 to load CSV data from a GitHub gist via `d3.csv`, render SVG axes with `d3.axisBottom` and `d3.axisLeft`, and display hover tooltips via mouseover and mouseout events. The visualization renders entirely as SVG with a custom tooltip div.