This histogram visualizes the relationship between age and average Body Mass Index (BMI) from health survey data, showing BMI distribution across age bins. The chart displays age on the x-axis and average BMI on the y-axis using orange rectangular bars. The code loads data via a CSV URL, converts string values to numbers, and computes BMI from height and weight fields. It uses D3 v7 APIs including `d3.csv`, `d3.bin`, `d3.scaleLinear`, `d3.axisBottom`, and `d3.axisLeft`. The visualization is rendered as an SVG with custom styling for ticks and labels.