1. Elizabeth II — Queen of the United Kingdom, Canada, Australia, and New Zealand astuteblogger.blogspot.com Taken when she was only an 18-year-old princess, this picture shows the young Elizabeth Alexandra Mary during her time in the Auxiliary Territorial Service during World War II, 1945. 2. Barack Obama — 44th U.S. President Lisa Jack/Contour by Getty Images Obama sits on the couch of a college friend smoking a cigarette in 1980, long before he would become president of the United States. 3. Hillary Clinton — Former U.S. Secretary of State and 2016 Presidential Candidate Lee Balterman/The LIFE Picture Collection / Getty Images Clinton, then Hillary Diane Rodham, sits for a photo shoot while attending Wellesley College, 1969. 4. Bill Clinton — 42nd U.S. President jakespresidential.blogspot.com In a rare encounter between a current and future president, a young Bill Clinton meets President John F. Kennedy in 1963. 5. Donald Trump — Entrepreneur and 2016 Presidential Candidate Seth Poppel/Yearbook Library The real estate mogul in his senior year of New York Military Academy, 1964. 6. Dilma Rousseff — President of Brazil Reuters This mugshot shows the future Brazilian president apprehended for her participation in a guerrilla movement against the country's military dictatorship. 7. Martin Luther King Jr. — Minister and Civil Rights Leader Christine King Farri King at the age of 6. 8. Vladimir Putin — President of Russia Laski Diffusion / Getty Images An 18-year-old Putin's class photo, 1970. 9. Xi Jinping — General Secretary of the Communist Party of China Xinhua Xi Jinping, then party chief of Zhengding county, Hebei province, 1983. 10. Angela Merkel — Chancellor of Germany hdwallpapersfit.com Merkel, wearing a Free German Youth uniform, is awarded the Lessing Medal for outstanding social and academic performance, 1971. 11. John F. Kennedy — 35th U.S. President Hulton Archive / Getty Images This 1927 portrait shows the young president-to-be at age 10. 12. Joseph Stalin — Former Leader of the Soviet Union i.imgur.com Stalin at age 24 in 1902. 13. Fidel Castro — Former Prime Minister of Cuba pbs.org Fidel Castro relaxing at an outpost in the Sierra Maestra, 1957. 14. George W. Bush — 43rd U.S. President en.wikipedia.org George W. Bush as a baby with his parents, 1947. 15. Shinzō Abe — Prime Minister of Japan AP In the center of the picture, kindergartner Abe sits on the lap of his grandfather, then-Prime Minister Nobusuke Kishi. 16. Oprah Winfrey — Media Mogul Rex Shutterstock / REX Shutterstock Seventeen-year-old Winfrey shows off her "Miss Fire Prevention" trophy in her hometown of Nashville in 1971. 17. Albert Einstein — Theoretical Physicist uberly.com Einstein poses for a portrait at 14. 18. Bill Gates – Co-Founder of Microsoft Rex Shutterstock / REX Shutterstock A mugshot of Gates taken by the Albuquerque police in 1977 after he was arrested for traffic violation. 19. Steve Jobs – Co-Founder and Former CEO of Apple Tom Munnecke / Getty Images Jobs poses at the first West Coast Computer Faire in San Francisco, where the Apple II computer debuted in 1977. 20. Mahatma Gandhi — Leader of the Indian independence movement prezi.com A young Gandhi poses for a picture in 1906. 21. Pope Francis — 266th Pope of the Catholic Church blogger.com Jorge Mario Bergoglio, who would become Pope Francis, poses for a portrait as a teenager in Buenos Aires.