[OC] US population history, split by age group

Interactive graph: [US population by age group](http://graphcog.com/us-population)

Use the controls to change the number of age groups, or toggle between ratios, growth rates, and totals.

Some observations:

– Over 65s now account for almost 17% of the population, compared to less than 5% 100 years ago.

– Total population is three times higher than 100 years ago.

– Population growth has been steadily declining, to its lowest rate since World War II.

Source of data: [census.gov](http://census.gov)

Tool: Chart.js