Malala Yousafzai, the youngest winner in the history of Nobel Peace Prize, spoke to the delegates of the Oslo Summit on Education for Development, including United Nations Secretary-General Ban Ki-moon, at Oslo Plaza, Norway on Tuesday to urge world leaders to spend more money on education.

One hundred countries committed in the World Education Forum last May to providing 12 years of free primary and secondary education to children until 2030. UNESCO published a report saying that 12 years of education per child is equivalent to $340 billion. However, Malala opposed the report, saying that this amount is trifle compared to the global military spending each country is producing.

"The shocking truth is that world leaders have the money to fully fund global education - but they are choosing to spend it on other things, like their military budgets," the young education activist from Pakistan said, according to ABC News. "In fact, if the whole world stopped spending money on the military for just 8 days, we could have the $39 billion needed to provide 12 years of free, quality education to every child on the planet."

At 17 years old, Malala's only concern is to continuously remain the "Voice of Children," even though she will be leaving the children's age bracket in four days when she turns 18.

"I am here as the voice of children. My life of being a child will come to an end, it's quite hard. I think there's no limit of age ... to speak of all children's rights. My father has been doing it as a teacher and I will continue to do it as a woman. As an adult, you can be the voice of children," said the youngest Nobel Laureate, according to Yahoo! News

As a preparation for her upcoming birthday advocacy on Sunday, Malala posted what she's planning to do on her Instagram and asked her supporters to send their personal messages to the world's leaders.

"Post a photo of yourself holding up your favorite book and share why you choose #BooksNotBullets. Tell world leaders to fund the real weapon for change, education! I urge world leaders to prioritize education because education is the only way through which we can defeat terrorism, fight against poverty and bring peace and prosperity," Malala wrote in her Instagram post while holding the book, "The Diary of a Young Girl: Anne Frank." 

As of today, people around the world are posting #BooksNotBullets selfies to support Malala's birthday advocacy.