Question: Warren Truss continued as Deputy Prime Minister, until he retired in 2016 and was replaced by a politician born in which year ?

Barnaby Thomas Gerard Joyce (born 17 April 1967) is an Australian politician who has served as the Deputy Prime Minister of Australia since 18 February 2016, as the Leader of the National Party of Australia since 11 February 2016, and as the Minister for Agriculture and Water Resources since 21 September 2015.  He was sworn in as Minister for Agriculture in the Abbott Government on 18 September 2013.  Water Resources was added to his portfolio on 21 September 2015 in the Turnbull Government. <SEP> The Turnbull Government is the federal executive government of Australia, led by the 29th Prime Minister of Australia, Malcolm Turnbull.  The government is made of members of the Liberal-National Coalition.  The prime ministership of Malcolm Turnbull commenced on 15 September 2015, when he was sworn in by the Governor-General of Australia.  The Turnbull Government succeeded the Abbott Government, which was elected at the 2013 federal election.  Warren Truss, the leader of the Nationals continued as Deputy Prime Minister, until he retired in 2016 and was replaced by Barnaby Joyce.  Turnbull took office by challenging the incumbent Liberal leader Tony Abbott in an internal leadership ballot. <SEP> The Swedish constitution of 1974 allows the Prime Minister of Sweden to appoint one of the Ministers in the cabinet as Deputy Prime Minister ("biträdande statsminister", also unofficially known as "vice statsminister", "Vice Prime Minister"), in case the Prime Minister for some reason is prevented from performing his or her duties.  However, if a Deputy Prime Minister has not been appointed, the Minister in the cabinet who has served the longest time (and if there are several with equal experience the one who is oldest) takes over as head of government.  Note that the person acting as Prime Minister does not do so on a permanent basis: if a Prime Minister dies, resigns or loses a vote of confidence in the Riksdag, the Speaker of the Riksdag will then confer with the parties of the Riksdag and propose a new Prime Minister, who must be tolerated by a majority of the Riksdag.  If the Prime Minister has resigned or lost a vote of confidence, he or she will remain the head of a government "ad interim" until the new Prime Minister assumes his or her office.  The only case where the governmental line of succession becomes relevant is when the Prime Minister dies (upon which the person next in the line of succession serves as the head of a government "ad interim") or when the Prime Minister is on leave or for any other reason incapable of serving, but still remains in office.  This might be compared to the Presidential line of succession in the United States, where the person next in line assumes the Presidency throughout the remainder of the term if the President dies, resigns or is impeached. <SEP> The Abbott Government was the federal executive government of Australia led by Prime Minister Tony Abbott.  The Government was made up of members of the Liberal–National Coalition.  The Leader of the Nationals, Warren Truss, served as Deputy Prime Minister.  Following the 2013 Australian federal election on 7 September, the Coalition defeated the second Rudd Government, ending six years of Labor Government.  The Abbott Government was sworn into office on 18 September 2013.  Less than two years later on 14 September 2015, Malcolm Turnbull defeated Abbott in a leadership ballot, 54 votes to 44.