The raw data behind the story "Both Republicans And Democrats Have an Age Problem" https://fivethirtyeight.com/features/both-republicans-and-democrats-have-an-age-problem/.
A data frame with 18,635 rows representing members of Congress (House and Senate) and 13 variables:
Chamber of congress: House of Representatives or Senate.
Boolean variable of whether member was an incumbent.
Start date of session.
Age at start of session.