List of Australian Prime Ministers by age List of officeholders List of officeholders

| _ | Prime_Minister | Date_of_birth | Start_date_of_first_term | Age_at_beginning_of_first_term | End_date_of_final_term | Total_time_in_office | Date_of_death | Lifespan_ |
|---|---|---|---|---|---|---|---|---|
| 1 | Edmund Barton | 18 January 1849 | 1 January 1901 | 51 years, 348 days | 24 September 1903 | 996 days | 7 January 1920 | 25,920 days (70 years, 354 days) |
| 2 | Alfred Deakin | 3 August 1856 | 24 September 1903 | 47 years, 52 days | 29 April 1910 | 1,774 days | 7 October 1919 | 23,074 days (63 years, 65 days) |
| 3 | Chris Watson | 9 April 1867 | 27 April 1904 | 37 years, 18 days | 18 August 1904 | 113 days | 18 November 1941 | 27,251 days (74 years, 223 days) |