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This directory contains various demographic data about the United States Senate and House of Representatives over time. Its been used in the following FiveThirtyEight articles:
- [Congress Today Is Older Than Its Ever Been](https://fivethirtyeight.com/features/aging-congress-boomers/), by Geoffrey Skelley (March 31, 2023)
- [Congress Today Is Older Than Its Ever Been](https://fivethirtyeight.com/features/aging-congress-boomers/), by Geoffrey Skelley (April 3, 2023)
`data_aging_congress.csv` contains information about the age of every member of the U.S. Senate and House from the 66th Congress (1919-1921) to the 118th Congress (2023-2025). Data is as of March 29, 2023, and is based on all voting members who served in either the Senate or House in each Congress. The data excludes delegates or resident commissioners from non-states. Any member who served in both chambers in the same Congress was assigned to the chamber in which they cast more votes. We began with the 66th Congress because it was the first Congress in which all senators had been directly elected, rather than elected by state legislatures, following the [ratification of the 17th Amendment in 1913](https://constitutioncenter.org/the-constitution/amendments/amendment-xvii).