UK Prime Ministers in order of age at beginning of (first) term.

Currently Jeremy Corbyn is 66 (birthday May 26th 1949) and if he was to win the UK General Election 2020 He would be the oldest person to be elected to the job of Prime Minister as he will be just short of his 71st Birthday in 2020

From Wikipedia, the free encyclopedia SOURCE

This is a list of UK Prime Ministers by longevity. For those Prime Ministers still living, the lifespan column gives the age as of 12 September.

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
Henry Temple	20 October 1784	6 February 1855	70 years, 109 days	18 October 1865[1]	3,429 days	18 October 1865	29,582 days (80 years, 363 days)
Henry Campbell-Bannerman	7 September 1836	5 December 1905	69 years, 89 days	3 April 1908	850 days	22 April 1908	26,159 days (71 years, 228 days)
Spencer Compton	18 March 1673	16 February 1742	68 years, 335 days	2 July 1743[1]	501 days	2 July 1743	25,672 days (70 years, 106 days)
George Hamilton-Gordon	28 January 1784	19 December 1852	68 years, 326 days	30 January 1855	772 days	14 December 1860	28,079 days (76 years, 321 days)
Neville Chamberlain	18 March 1869	28 May 1937	68 years, 71 days	10 May 1940	1,078 days	9 November 1940	26,168 days (71 years, 236 days)
Charles Grey	13 March 1764	22 November 1830	66 years, 254 days	16 July 1834	1,332 days	17 July 1845	29,710 days (81 years, 126 days)
Winston Churchill	30 November 1874	10 May 1940	65 years, 162 days	6 April 1955	3,161 days	24 January 1965	32,927 days (90 years, 55 days)
Andrew Bonar Law	16 September 1858	23 October 1922	64 years, 37 days	22 May 1923	211 days	30 October 1923	23,784 days (65 years, 44 days)
James Callaghan	27 March 1912	5 April 1976	64 years, 9 days	4 May 1979	1,124 days	26 March 2005	33,967 days (92 years, 364 days)
Benjamin Disraeli	21 December 1804	27 February 1868	63 years, 68 days	21 April 1880	2,530 days	19 April 1881	27,878 days (76 years, 119 days)
Harold Macmillan	10 February 1894	10 January 1957	62 years, 335 days	18 October 1963	2,472 days	29 December 1986	33,924 days (92 years, 322 days)
Clement Attlee	3 January 1883	26 July 1945	62 years, 204 days	26 October 1951	2,283 days	8 October 1967	30,958 days (84 years, 278 days)
Thomas Pelham-Holles	21 July 1693	16 March 1754	60 years, 238 days	26 May 1762	2,765 days	17 November 1768	27,512 days (75 years, 119 days)
Alec Douglas-Home	2 July 1903	18 October 1963	60 years, 108 days	16 October 1964	364 days	9 October 1995	33,702 days (92 years, 99 days)
William Ewart Gladstone	29 December 1809	3 December 1868	58 years, 340 days	2 March 1894	4,508 days	19 May 1898	32,283 days (88 years, 141 days)
Arthur Wellesley	1 May 1769[3]	22 January 1828	58 years, 266 days	10 December 1834	1,055 days	14 September 1852	30,451 days (83 years, 136 days)
Anthony Eden	12 June 1897	6 April 1955	57 years, 298 days	10 January 1957	645 days	14 January 1977	29,070 days (79 years, 216 days)
William Pitt the Elder	15 November 1708	30 July 1766	57 years, 257 days	14 October 1768	807 days	11 May 1778	25,379 days (69 years, 177 days)
Ramsay MacDonald	12 October 1866	22 January 1924	57 years, 102 days	7 June 1935	2,480 days	9 November 1937	25,960 days (71 years, 28 days)
George Canning	11 April 1770	10 April 1827	56 years, 364 days	8 August 1827[1]	120 days	8 August 1827	20,937 days (57 years, 119 days)
Gordon Brown	20 February 1951	27 June 2007	56 years, 127 days	11 May 2010	1,049 days		23,580 days (64 years, 204 days)
Stanley Baldwin	3 August 1867	23 May 1923	55 years, 293 days	28 May 1937	2,633 days	14 December 1947	29,352 days (80 years, 133 days)
Herbert Asquith	12 September 1852	5 April 1908	55 years, 206 days	5 December 1916	3,166 days	15 February 1928	27,548 days (75 years, 156 days)
Robert Cecil	3 February 1830	23 June 1885	55 years, 140 days	11 July 1902	5,000 days	22 August 1903	26,862 days (73 years, 200 days)
William Lamb	15 March 1779	16 July 1834	55 years, 123 days	30 August 1841	2,447 days	24 November 1848	25,456 days (69 years, 254 days)
Arthur Balfour	25 July 1848	11 July 1902	53 years, 351 days	5 December 1905	1,243 days	19 March 1930	29,821 days (81 years, 237 days)
Edward Heath	9 July 1916	19 June 1970	53 years, 345 days	4 March 1974	1,354 days	17 July 2005	32,515 days (89 years, 8 days)
David Lloyd George	17 January 1863	7 December 1916	53 years, 325 days	22 October 1922	2,145 days	26 March 1945	30,018 days (82 years, 68 days)
John Russell	18 August 1792	30 June 1846	53 years, 316 days	28 June 1866	2,306 days	28 May 1878	31,328 days (85 years, 283 days)
Margaret Thatcher	13 October 1925	4 May 1979	53 years, 203 days	28 November 1990	4,226 days	8 April 2013	31,954 days (87 years, 177 days)
Edward Smith-Stanley	29 March 1799	23 February 1852	52 years, 331 days	27 February 1868	1,386 days	23 October 1869	25,775 days (70 years, 208 days)
George Grenville	14 October 1712	16 April 1763	50 years, 184 days	13 July 1765	819 days	13 November 1770	21,214 days (58 years, 30 days)
John Stuart	25 May 1713	26 May 1762	49 years, 1 day	8 April 1763	317 days	10 March 1792	28,779 days (78 years, 290 days)
Henry Pelham	25 September 1694	27 August 1743	48 years, 336 days	6 March 1754[1]	3,844 days	6 March 1754	21,711 days (59 years, 162 days)
Harold Wilson	11 March 1916	16 October 1964	48 years, 219 days	5 April 1976	2,835 days	24 May 1995	28,928 days (79 years, 74 days)
John Major	29 March 1943	28 November 1990	47 years, 244 days	2 May 1997	2,347 days		26,465 days (72 years, 167 days)
Spencer Perceval	1 November 1762	4 October 1809	46 years, 337 days	11 May 1812[2]	950 days	11 May 1812	18,088 days (49 years, 192 days)
Robert Peel	5 February 1788	10 December 1834	46 years, 308 days	29 June 1846	1,883 days	2 July 1850	22,792 days (62 years, 147 days)
Archibald Primrose	7 May 1847	5 March 1894	46 years, 302 days	22 June 1895	474 days	21 May 1929	29,964 days (82 years, 14 days)
William Grenville	25 October 1759	11 February 1806	46 years, 109 days	31 March 1807	413 days	12 January 1834	27,107 days (74 years, 79 days)
William Petty	2 May 1737	4 July 1782	45 years, 63 days	2 April 1783	272 days	7 May 1805	24,841 days (68 years, 5 days)
William Cavendish-Bentinck	14 April 1738	2 April 1783	44 years, 353 days	4 October 1809	1,179 days	30 October 1809	26,131 days (71 years, 199 days)
Frederick Robinson	1 November 1782	31 August 1827	44 years, 303 days	21 January 1828	143 days	28 January 1859	27,846 days (76 years, 88 days)
Robert Walpole	26 August 1676	4 April 1721	44 years, 221 days	11 February 1742	7,618 days	18 March 1745	25,040 days (68 years, 204 days)
Tony Blair	6 May 1953	2 May 1997	43 years, 361 days	27 June 2007	3,708 days		22,774 days (62 years, 129 days)
Henry Addington	30 May 1757	17 March 1801	43 years, 291 days	10 May 1804	1,150 days	15 February 1844	31,671 days (86 years, 261 days)
David Cameron	9 October 1966	11 May 2010	43 years, 214 days	Incumbent	1,950 days		17,870 days (48 years, 338 days)
Robert Jenkinson	7 June 1770	8 June 1812	42 years, 1 day	9 April 1827	5,418 days	4 December 1828	21,364 days (58 years, 180 days)
Frederick North	13 April 1732	28 January 1770	37 years, 290 days	22 March 1782	4,436 days	5 August 1792	22,029 days (60 years, 114 days)
William Cavendish	8 May 1720	16 November 1756	36 years, 192 days	25 June 1757	221 days	2 October 1764	16,218 days (44 years, 147 days)
Charles Watson-Wentworth	13 May 1730	13 July 1765	35 years, 61 days	1 July 1782[1]	478 days	1 July 1782	19,042 days (52 years, 49 days)
Augustus FitzRoy	28 September 1735	14 October 1768	33 years, 16 days	28 January 1770	471 days	14 March 1811	27,560 days (75 years, 167 days)
William Pitt the Younger	28 May 1759	19 December 1783	24 years, 205 days	23 January 1806[1]	6,917 days	23 January 1806	17,041 days (46 years, 240 days)
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