Jean-Claude Juncker (born 1954), Prime Minister of Luxembourg since 20 January 1995 (EPP)
Jan Peter Balkenende (born 1956), Prime Minister of the Netherlands since 22 July 2002 (EPP) - has just lost election so won't be back next time
Matti Vanhanen (born 1955), Prime Minister of Finland since 24 June 2003 (ELDR) - resigns effective tomorrow
José Luis Rodríguez Zapatero (born 1960) Prime Minister of Spain since 17 April 2004 (PES)
Lawrence Gonzi (born 1953) Prime Minister of Malta since 1 May 2004 (EPP)
José Manuel Barroso (Portuguese, born 1956) President of the European Commission since 23 November 2004 (EPP)
José Sócrates (born 1957) Prime Minister of Portugal since 12 March 2005 (PES)
Andrus Ansip (born 1956) Prime Minister of Estonia since 12 April 2005 (ELDR)
Angela Merkel (born 1954) Chancellor of Germany since 22 November 2005 (EPP)
Robert Fico (born 1964) Prime Minister of Slovakia since 4 July 2006 (PES) - did badly in last weekend's election and probably won't be back
Fredrik Reinfeldt (born 1965) Prime Minister of Sweden since 6 October 2006 (EPP)
Nicolas Sarkozy (born 1955) President of France since 16 May 2007 (EPP)
Donald Tusk (born 1957) Prime Minister of Poland since 16 November 2007 (EPP)
Dimitris Christofias (born 1946) President of [Greek] Cyprus since 28 February 2008 (PEL)
Brian Cowen (born 1960) Taoiseach since 07 May 2008 (ELDR)
Silvio Berlusconi (born 1936) Prime Minister of Italy since 8 May 2008 (EPP) - previously PM 1994-95 and 2001-06
Borut Pahor (born 1963) Prime Minister of Slovenia since 21 November 2008 (PES)
Werner Faymann (born 1960) Chancellor of Austria since 02 December 2008 (PES)
Andrius Kubilius (born 1956) Prime Minister of Lithuania since 09 December 2008 (EPP) - previously PM in 1999-2000, before Lithuania joined the EU
Emil Boc (born 1966) Prime Minister of Romania since 22 December 2008 (EPP)
Valdis Dombrovskis (born 1971) Prime Minister of Latvia since 12 March 2009 (EPP)
Lars Løkke Rasmussen (born 1964) Prime Minister of Denmark since 05 April 2009 (ELDR)
Jan Fischer (born 1951) Prime Minister of the Czech Republic since 8 May 2009 (Independent) - was a technocrat leading government of experts and will certainly be replaced after last week's elections
Jerzy Buzek (Polish, born 1940) President of the European Parliament since 14 July 2009 (EPP)
Boyko Borisov (born 1959) Prime Minister of Bulgaria since 27 July 2009 (EPP)
George Papandreou (born 1952) Prime Minister of Greece since 06 October 2009 (PES)
Yves Leterme (born 1960) Prime Minister of Belgium since 25 November 2009 (EPP) - previously PM in 2008; has just had an appalling election result but may take a while to agree his replacement
Herman van Rompuy (Belgian, born 1947) President of the European Council since 01 December 2009 (EPP)
David Cameron (born 1966) Prime Minister of United Kingdom since 11 May 2010 (ECR)
Viktor Orbán (born 1963) Prime Minister of Hungary since 29 May 2010 (EPP) - previously PM 1998-2002, before Hungary joined the EU
Jean-Claude Juncker has been in power for longer than the combined terms of his second and third longest serving colleagues, Jan Peter Balkenende and Matti Vanhanen - both of whom are on their way out, while he remains pretty secure.
14 of the 27 heads of state and government, and the presidents of all three EU institutions, are in the European People's Party. (Though Leterme and Balkenende are on their way out.) 6 (including Fico, who is also on his way out) are in the Party of European Socialists. 4 (including Vanhanen who will be replaced by a party colleague) are Liberals. Politically isolated are Fischer (independent), Christofias (Communist) and Cameron (Tory).
The only woman is Angela Merkel, though the new Finnish PM who takes over tomorrow will improve that score.
The average year of birth is 1956, the year that European Commission President Barroso was born, with 18 of the 30 born between 1951 and 1960 inclusive.
Silvio Berlusconi is the only leader born before the second world war. His oldest child is older than the Romanian, British and Latvian prime ministers. I am still younger than all of them except the Latvian PM and the new Finnish PM who takes over tomorrow.
To be continued next time...