Question: Out of all G7 leaders who entered office before 1980 , which one is oldest ?

text: List of G7 leaders
List of Senior G7 Leaders
The following is a chronology of senior G7 leaders from the founding of the G6 ( a precursor organization to the G8 ) to the present . [ 2 ]
This is a list of the heads of government of the Group of Seven nations at each G6, G7, G8 summit since the organisation's inception in 1975. The Group consists of the 6-7-8 largest industrialized democracies, Canada, France, Germany, Italy, Japan, Russia, the United Kingdom and the United States. Also in attendance is the President of the European Commission, who represents the European Union. The G7 holds an annual summit, which each nation's head of government attends. Each year the heads of government take turns assuming the presidency, whose job it is to set the agenda for and host the annual summit. The leader who has been in office the longest of the eight leaders is considered the Senior G7 leader; currently Angela Merkel since 2014, and previously from 2011 to 2012. While the current G7 consists of seven nations, it didn't always. The group was formed as the Group of Six, G6, including all of today's members minus Canada. Under the leadership of Prime Minister Pierre Trudeau, Canada joined in the second year of the group's existence, 1976, forming the Group of Seven, G7. Russia, as the successor nation to the USSR, joined the Group of Eight, G8, in 1997, following the collapse of its Communist predecessor, under the leadership of President Boris Yeltsin. As of 2020, Russia is currently suspended from the Group of 8.
Entered office as Head of State or Government Began time as senior G8 leader Ended time as senior G8 leader Term Length Person Office
16 October 1964 15 November 1975 5 April 1976 142 days Harold Wilson Prime Minister of the United Kingdom
16 May 1974 5 April 1976 27 June 1976 83 days Helmut Schmidt Chancellor of West Germany
20 April 1968 27 June 1976 4 June 1979 2 years , 342 days Pierre Trudeau Prime Minister of Canada
16 May 1974 4 June 1979 3 March 1980 273 days Helmut Schmidt Chancellor of West Germany
20 April 1968 3 March 1980 30 June 1984 4 years , 119 days Pierre Trudeau Prime Minister of Canada
4 May 1979 30 June 1984 28 November 1990 6 years , 151 days Margaret Thatcher Prime Minister of the United Kingdom
10 May 1981 28 November 1990 17 May 1995 4 years , 170 days François Mitterrand President of France
1 October 1982 17 May 1995 27 October 1998 3 years , 163 days Helmut Kohl Chancellor of Germany
10 July 1991 27 October 1998 31 December 1999 1 year , 65 days Boris Yeltsin President of Russia
20 January 1993 31 December 1999 20 January 2001 1 year , 20 days Bill Clinton President of the United States
4 November 1993 20 January 2001 12 December 2003 2 years , 326 days Jean Chrétien Prime Minister of Canada
17 May 1995 12 December 2003 16 May 2007 3 years , 155 days Jacques Chirac President of France
2 May 1997 16 May 2007 27 June 2007 42 days Tony Blair Prime Minister of the United Kingdom
7 May 2000 27 June 2007 7 May 2008 315 days Vladimir Putin President of Russia
20 January 2001 7 May 2008 20 January 2009 258 days George W. Bush President of the United States
10 May 1994 20 January 2009 16 November 2011 2 years , 300 days Silvio Berlusconi Prime Minister of Italy
22 November 2005 16 November 2011 7 May 2012 173 days Angela Merkel Chancellor of Germany
7 May 2000 7 May 2012 24 March 2014 1 year , 321 days Vladimir Putin President of Russia
22 November 2005 24 March 2014 Incumbent 5 years , 321 days Angela Merkel Chancellor of Germany