List of Prime Ministers of New Zealand by date of birth

Century

Nineteenth century • (26) 

Henry Sewell (1807), Alfred Domett (1811), George Grey (1812), Frederick Whitaker (1812), William Fox (1812), Daniel Pollen (1813), Edward Stafford (1819), Frederick Weld (1823), George Waterhouse (1824), John Hall (1824), Harry Atkinson (1831), Julius Vogel (1835), John Ballance (1839), Robert Stout (1844), Richard Seddon (1845), William Hall-Jones (1851), Francis Bell (1851), Thomas Mackenzie (1853), William Massey (1856), Joseph Ward (1856), George Forbes (1869), Michael Joseph Savage (1872), Gordon Coates (1878), Walter Nash (1882), Peter Fraser (1884), Sidney Holland (1893)

Twentieth century • (12) 

Keith Holyoake (1904), Jack Marshall (1912), Robert Muldoon (1921), Norman Kirk (1923), Bill Rowling (1927), Jim Bolger (1935), Geoffrey Palmer (1942), David Lange (1942), Mike Moore (1949), Helen Clark (1950), Jenny Shipley (1952), John Key (1961), Bill English (1961)

Generation

(According to the books by William Strauss and Neil Howe)

Transcendental Generation • (1792–1821) 

Henry Sewell (1807), Alfred Domett (1811), George Grey (1812), Frederick Whitaker (1812), William Fox (1812), Daniel Pollen (1813), Edward Stafford (1819)

Gilded Generation • (1822–1842) 

Frederick Weld (1823), George Waterhouse (1824), John Hall (1824), Harry Atkinson (1831), Julius Vogel (1835), John Ballance (1839)

Progressive Generation • (1843–1859) 

Robert Stout (1844), Richard Seddon (1845), William Hall-Jones (1851), Francis Bell (1851), Thomas Mackenzie (1853), William Massey (1856), Joseph Ward (1856)

Missionary Generation • (1860–1881) 

George Forbes (1869), Michael Joseph Savage (1872), Gordon Coates (1878)

Lost Generation • (1882–1900) 

Walter Nash (1882), Peter Fraser (1884), Sidney Holland (1893)

Greatest Generation • (1901–1923) 

Keith Holyoake (1904), Jack Marshall (1912), Robert Muldoon (1921), Norman Kirk (1923)

Silent Generation • (1924–1941) 

Bill Rowling (1927), Jim Bolger (1935)

Baby Boom Generation • (1942–1960) 

Geoffrey Palmer (1942), David Lange (1942), Mike Moore (1949), Helen Clark (1950), Jenny Shipley (1952)

Generation X • (1961–1980) 

John Key (1961), Bill English (1961)

In same year

George Grey, Frederick Whitaker and William Fox were all born in 1812

George Waterhouse and John Hall were both born in 1824

William Hall-Jones and Francis Bell were both born in 1851

William Massey and Joseph Ward were both born in 1856

Geoffrey Palmer and David Lange were both born in 1942

John Key and Bill English were both born in 1961

On the same date

Only one date, 23 April, has been the birthday of more than one Prime Minister—Frederick Whitaker and Edward Stafford. The birthday problem indicates that, on average, a birthday will be shared after about 25 Prime Ministers have served. The Whitaker–Stafford birthday coincidence, the only one to date, occurred after only five distinct Prime Ministers had served.

Most and least births by month

Seven prime ministers – John Ballance, Francis Bell, Thomas Mackenzie, William Massey, George Forbes, Michael Joseph Savage and Jack Marshall were born in the month of March. Only one prime minister – Sidney Holland was born in the month of October. None as of yet have been born in the month of July.

Born before predecessor(s)

4th Prime Minister Alfred Domett (born 20 May 1811)

5th Prime Minister Frederick Whitaker (born 23 April 1812)

9th Prime Minister Daniel Pollen (born 2 June 1813)

10th Prime Minister Harry Atkinson (born 1 November 1831)

11th Prime Minister George Grey (born 14 April 1812)

12th Prime Minister John Hall (born 18 December 1824)

14th Prime Minister John Ballance (born 27 March 1839)

18th Prime Minister Thomas Mackenzie (born 10 March 1853)

19th Prime Minister William Massey (born 26 March 1856)

20th Prime Minister Francis Bell (born 31 March 1851)

22nd Prime Minister George Forbes (born 12 March 1869)

23rd Prime Minister Michael Joseph Savage (born 23 March 1872)

27th Prime Minister Walter Nash (born 12 February 1882)

31st Prime Minister Robert Muldoon (born 25 September 1921)

33rd Prime Minister Geoffrey Palmer (born 21 April 1942)

35th Prime Minister Jim Bolger (born 31 May 1935)

37th Prime Minister Helen Clark (born 26 February 1950)

Governor-General at time of birth

Robert FitzRoy (1843–1845)

George Grey (1845–1854) (1861–1868)

Thomas Gore Browne (1855–1861)

George Bowen (1868–1873)

Marquess of Normanby (1874–1879)

Arthur Hamilton-Gordon (1880–1882)

William Jervois (1883–1889)

Earl of Glasgow (1892–1897)

Earl of Ranfurly (1897–1904)

Baron Islington (1910–1912)

Earl Jellicoe (1920–1924)

Sir Charles Fergusson (1924–1930)

Viscount Galway (1935–1941)

Sir Cyril Newall (1941–1946)

Baron Freyberg (1946–1952)

Viscount Cobham (1957–1962)

Prime Minister at time of birth

Edward Stafford (1856–1861) (1865–1869) (1872)

William Fox (1856) (1861–1862) (1869–1872) (1873)

George Grey (1877–1879)

John Hall (1879–1882)

Harry Atkinson (1876–1877) (1883–1884) (1884) (1887–1891)

Richard Seddon (1893–1906)

Joseph Ward (1906–1912) (1928–1930)

William Massey (1912–1925)

Gordon Coates (1925–1928)

George Forbes (1930–1935)

Peter Fraser (1940–1949)

Sidney Holland (1949–1957)

Keith Holyoake (1957) (1960–1972)