This visualization shows the age distribution of a population, separated by sex and marital status. The pyramid displays males on the left and females on the right, with the y-axis showing age from 0 to 90 and the x-axis representing population counts in thousands. Each age group is broken down by marital status (single, married, divorced, widowed), with different colors representing each category. The chart uses the Observable Plot library, with `Plot.plot`, `Plot.areaX`, and `Plot.ruleX`/`Plot.ruleY` to construct the pyramid, while D3's `d3.csv` loads the population data.