This interactive scatter plot explores the relationship between patient age and a selectable health metric (cholesterol, resting blood pressure, max heart rate, oldpeak, or age) from a heart disease dataset. A dropdown menu controls the Y-axis variable. The visualization uses D3.js (v7) within a React framework to render an SVG, featuring a legend that allows users to hover and filter data points by gender, highlighting male and female patients in dark blue and pink, respectively. The chart updates dynamically with selections.