Jacinda Ardern has responded to NZ Firsts decision to back Labour.
Leading a country is, literally, among the toughest jobs in the world.
Usually it takes years of work, plentiful donations, hundreds of media apperances and hours upon hours of attending incredibly dull community events.
Interestingly, The Economist reported in 2011 many world leaders were getting younger - even as thepopulations of their countries age, reports News.com.au.
In fact, there are currently 12 world leaders under the age of 40.
Jacinda Ardern became a politician in 2008, and describes herself as a social democrat and a progressive who supports a welfare system for "those unable to support themselves".
She worked as a researcher and advisor at home, for former New Zealand Prime Minister Helen Clark, and in the United Kingdom for former British Prime Minister Tony Blair.
She grew up in the towns of Morrinsville and Murupara in the North Island and was raised Mormon, but left the church because of its stance on homosexuality and now considers herself agnostic.
She loved metalwork and history in school and is a fan of whisky.
2. North Korea - Kim Jong-Un, 33
Kim Jong-un inherited a dictatorship from his late father, Kim Jong-il. Photo / AP
Kim Jong-un has been Chairman of the Workers' Party of Korea and supreme leader of North Korea since his father, Kim Jong-il, died of a heart attack in 2011.
It's believed he was just 27 years old at the time.
Not much is known about his early life, except that he reportedly went to an English-language boarding school in Switzerland and loves to watch basketball.
The dictator is believed to have ordered the executions of at least 340 people since he took power, for reasons as trivial as napping or having a bad attitude.
Mr Kim's government is currently developing a nuclear weapons arsenal, and today his government issued a letter to Australia, asking our politicians to turn against US President Donald Trump.
3. France - Emmanuel Macron, 39
French President Emmanuel Macron speaks during a media conference at the conclusion of an EU summit in Brussels. Photo / Getty Images
French President Emmanuel Macron used to be an investment banker, who founded a centrist political party called En Marche! last year.
His dad was a neurologist and his mum was a paediatrician, and he's actually the first member of his family not to have a career in medicine.
He ventured into politics in 2012, serving as cabinet minister for former president Francois Hollande, and went from being a relative political nobody to beating far right opponent Marine Le Pen in May.
Ireland's Prime Minister Leo Varadkar. Photo / Getty Images
Leo Varadkar was elected Ireland's Taoiseach (pronounced Tee-sha, it basically means Prime Minister) in June.
His dad is an Indian doctor and his mum is an Irish nurse, and he followed his parents' footsteps and worked as a general practitioner for a few years.
However, once he joined his local council, he skyrocketed through the political ranks.
He's been in politics for a decade, and has previously served as the country's Minister for Social Protection, Minister for Health, and Minister for Transport, Tourism and Sport. Mr Varadkar is the first openly gay Taoiseach in history.
He first spoke publicly about it on his 36th birthday.
"It's not something that defines me. I'm not a half-Indian politician, or a doctor politician or a gay politician for that matter. It's just part of who I am, it doesn't define me, it is part of my character I suppose," he told national broadcaster RTE.
5. Austria - Sebastian Kurz, 31
Sebastian Kurz has just become the youngest leader on the world stage.
He leads the conservative Austrian People's Party, and his campaign focused largely on closing the country's borders and vowing to cut all benefits for foreigners.
Mr Kurz is an only child, who suspended his studies at the University of Vienna - where he studied law for seven years without getting a degree - to pursue politics.
He has served as the country's Foreign Minister since he was 27.
6. Ukraine - Volodymyr Groysman, 39
Радий вітати Президента Мальти пані Марі-Луїз Колейро Прека - вперше в Україні, вперше з державним візитом в історії наших дип. відносин. pic.twitter.com/gBz57HoBAm
He's in a bit of a tricky spot, because NATO is pretty much the only thing guaranteeing his country's security from its eastern neighbour, but US President Donald Trump has made it quite clear he's not a fan.
Mr Ratas is married with three children.
8. Qatar - Tamim Bin Hamad Al Thani, 37
Indonesian President Joko Widodo, right, greets Qatar's Emir Sheikh Tamim bin Hamad Al Thani. Photo / AP
Sheikh Tamim bin Hamad Al Thani is the eight Emir of Qatar, and he rose to power after his father abdicated in June 2013.
He was born in Doha, the capital, and went to high school in England before attending the Royal Military Academy Sandhurst - the institution where all British Army officers are trained.
Most Australians know Qatar as an occasional stopover on the way to Europe, but Sheikh Tamim is working hard on raising the oil-rich country's profile by hosting a wide range of international sporting events and investing in infrastructure.
He still plays competitive badminton, and has three wives and 10 children.
Saleh Ali al-Sammad is leader of Yemen's Houti movement, the rebel group that overthrew the country's government in February 2015.
At least 7600 people were killed and 42,000 injured in the coup, which also left 70 per cent of the country in need of foreign aid.
Basically, the rebels wanted to force the country's authoritarian president, Ali Abdullah Saleh, to surrender power to his deputy.
His leadership was plagued with a separist movement in the south and attacks from Al-Qaeda as well as corruption, unemployment and food insecurity.
In the end, many ordinary Yemenis supported the rebels, overthrowing the capital Sana'a and putting Saleh Al-Sammad in power.
10. Bhutan - Jigme Khesar Namgyel Wangchuck, 37
Bhutan's King (left) is two years older than Prince William, who is second in line to the British throne. Photo / Getty Images
Jigme Khesar Namgyel Wangchuck became King of Bhutan, a tiny Himalayan country between India and China, after his father abdicated in December last year.
He was educated in the United States before attending the University of Oxford in the United Kingdom, where he studied international relations.
The King has pretty big shoes to fill - his father ascended to the throne when he was just 16, and turned Bhutan into a constitutional monarchy with an emphasis on becoming the happiest country in the world.
His wedding to Jetsun Pema in 2011 was the largest media event in the country's history, and their first child was born in February last year.
San Marino is a miniscule enclave in Italy, about three hours from Florence.
It's one of the world's oldest republics, even though it's barely bigger than a city, and is known for its medieval architecture.
It has a parliamentary style of government, with 60 members elected every five years, and it headed by two captains regent, who are elected every six months and act as heads of state during that period.
