List of longest-serving G8 leaders

This is a list of the longest serving heads of government or heads of state in the G7. The G7 leaders are the Prime Minister of Canada, the President of France, the Chancellor of Germany, the Prime Minister of Italy, the Prime Minister of Japan, the Prime Minister of the United Kingdom, and the President of the United States.

Angela Merkel is the senior G7 leader, a title she kept from 2011 until 2012, regaining seniority in 2014 upon Russia's expulsion from the G8. Merkel has been in office since 22 November 2005.

After Merkel in seniority is the Prime Minister of Japan Shinzō Abe, who took office on 26 December 2012, the Prime Minister of Canada Justin Trudeau, who took office on 4 November 2015, the Prime Minister of the United Kingdom Theresa May, who took office on 13 July 2016, the Prime Minister of Italy Paolo Gentiloni, who took office on 12 December 2016, the President of the United States Donald Trump, who took office on 20 January 2017, and the last in seniority is the President of France Emmanuel Macron, who took office on 14 May 2017.

...
Wikipedia