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 |
|---|---|---|---|---|---|---|---|
| 14 | Adlai Stevenson III | October 10, 1930 | November 17, 1970 | January 3, 1981 | Illinois | Democrat | 43years, 76days |
| 15 | John V. Tunney | June 26, 1934 | January 2, 1971 | January 1, 1977 | California | Democrat | 43years, 30days |
| 16 | Bill Brock | November 23, 1930 | January 3, 1971 | January 3, 1977 | Tennessee | Republican | 43years, 29days |
| 16 | James L. Buckley | March 9, 1923 | January 3, 1971 | January 3, 1977 | New York | Conservative | 43years, 29days |
| 16 | Lowell P. Weicker, Jr. | May 16, 1931 | January 3, 1971 | January 3, 1989 | Connecticut | Republican | 43years, 29days |
| 19 | David H. Gambrell | December 20, 1929 | February 1, 1971 | November 8, 1972 | Georgia | Democrat | 43years, 0days |