This bar chart tracks the decline of patients in the AF Well state within the Warfarin Line of Therapy 1 over advancing age, from 70 to 90 years. Each bar represents the cohort count at a specific age, showing a clear downward trend as the population ages. The visualization uses D3 v5 with SVG rendering, employing `scaleLinear` for the x-axis, `scaleBand` for the y-axis, and `axisBottom` with a custom tick format. The chart also includes horizontal grid lines and a custom title, with data sourced from a CSV file containing 36 parsed numerical columns.