List of Presidents of the United States by age Presidential age-related data Presidential age-related data

| President | Became_Oldest_Living_President | Ceased_to_Be_Oldest_Living_President | Age_at_Start_Date | Age_at_End_Date | Duration_Years_Days | Duration_Days_ |
|---|---|---|---|---|---|---|
| Harry S. Truman | October 20, 1964 | December 26, 1972 | 80 years, 165 days | 88 years, 232 days | 8 years, 67 days | 2,989 days |
| Lyndon B. Johnson | December 26, 1972 | January 22, 1973 | 64 years, 121 days | 64 years, 148 days | 0 years, 27 days | 27 days |
| Richard Nixon | January 22, 1973 | January 20, 1981 | 60 years, 13 days | 68 years, 11 days | 7 years, 364 days | 2,920 days |
| Ronald Reagan | January 20, 1981 | June 5, 2004 | 69 years, 349 days | 93 years, 120 days | 23 years, 137 days | 8,537 days |
| Gerald Ford | June 5, 2004 | December 26, 2006 | 90 years, 327 days | 93 years, 165 days | 2 years, 204 days | 934 days |