A population pyramid is a graphical illustration of population distribution across different age groups and genders.
Population pyramids consist of a series of histogram bars on opposing sides, with one side representing male and the other female. Each row (or bin) of a population pyramid represents an age group and together they form the shape of a pyramid.
Always place the y-axis in the middle of the x-axis at the zero marker.
Always display males on the left and females on the right.
Always display age groups on the y-axis and population size on the x-axis.
Always use uniform bin sizes.
Never use more than two colors.
It is recommended that you alternate between two shades of color for each row for improved legibility.
It is recommended that you leave space between each row.
It is recommended that you label the y-axis on boths sides of the chart.
It is recommended that you use different colors to represent male and female.
It is not recommended that you label the y-axis in the center of the chart.