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_ |
|---|---|---|---|---|---|---|
| John Quincy Adams | June 8, 1845 | February 23, 1848 | 77 years, 332 days | 80 years, 227 days | 2 years, 260 days | 990 days |
| Martin Van Buren | February 23, 1848 | July 24, 1862 | 65 years, 80 days | 79 years, 231 days | 14 years, 151 days | 5,265 days |
| James Buchanan | July 24, 1862 | June 1, 1868 | 71 years, 92 days | 77 years, 39 days | 5 years, 313 days | 2,139 days |
| Millard Fillmore | June 1, 1868 | March 8, 1874 | 68 years, 146 days | 74 years, 60 days | 5 years, 280 days | 2,106 days |
| Andrew Johnson | March 8, 1874 | July 31, 1875 | 65 years, 69 days | 66 years, 214 days | 1 year, 145 days | 510 days |