Earliest serving United States Senator Earliest serving Senators currently living Earliest serving Senators currently living

| Rank_ | Senator | Date_of_birth | Entered_Senate | Left_Senate | State_served | Party | Time_since_entry |
|---|---|---|---|---|---|---|---|
| 20 | Elaine S. Edwards | March 8, 1929 | August 1, 1972 | November 13, 1972 | Louisiana | Democrat | 41years, 184days |
| 21 | Sam Nunn | September 8, 1938 | November 8, 1972 | January 3, 1997 | Georgia | Democrat | 41years, 85days |
| 22 | Bennett Johnston Jr. | June 10, 1932 | November 13, 1972 | January 3, 1997 | Louisiana | Democrat | 41years, 80days |
| 23 | James Abourezk | February 24, 1931 | January 3, 1973 | January 3, 1979 | South Dakota | Democrat | 41years, 29days |
| 23 | Joe Biden | November 20, 1942 | January 3, 1973 | January 15, 2009 | Delaware | Democrat | 41years, 29days |
| 23 | Dick Clark | September 14, 1928 | January 3, 1973 | January 3, 1979 | Iowa | Democrat | 41years, 29days |
| 23 | Pete Domenici | May 7, 1932 | January 3, 1973 | January 3, 2009 | New Mexico | Republican | 41years, 29days |