01of 06Maddox at 3Justin Goff/Getty ImagesAngelina Jolieand Maddox at theShark Talepremiere at the 61st Venice Film Festival in 2004.In 2002, Jolie, 44, adopted Maddox at the age of seven months from a Cambodian orphanage after bonding with him while shootingLara Croft: Tomb Raider. She was married to Billy Bob Thornton at the time, but adopted him on her own.He’d eventually became a big brother to five younger siblings: Pax, 15, Zahara, 14, Shiloh, 13, and twins Knox and Vivienne, 11.

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Maddox at 3

Justin Goff/Getty Images

Angelina Jolie and Maddox

Angelina Jolieand Maddox at theShark Talepremiere at the 61st Venice Film Festival in 2004.

In 2002, Jolie, 44, adopted Maddox at the age of seven months from a Cambodian orphanage after bonding with him while shootingLara Croft: Tomb Raider. She was married to Billy Bob Thornton at the time, but adopted him on her own.

He’d eventually became a big brother to five younger siblings: Pax, 15, Zahara, 14, Shiloh, 13, and twins Knox and Vivienne, 11.

02of 06A teenager at 13Jon Kopaloff/FilmMagicMaddox at the Los Angeles premiere his mother’s filmMaleficentin 2014.

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A teenager at 13

Jon Kopaloff/FilmMagic

Maddox Jolie-Pitt

Maddox at the Los Angeles premiere his mother’s filmMaleficentin 2014.

03of 06Learning on setAngelina Jolie with son Maddox Jolie-Pitt and book author Loung Ung on set ofFirst They Killed My Father.Pax Jolie-Pitt/NetflixIn 2016, Maddox worked as an executive producer on his mother’s film,First They Killed My Father.Maddox previously told PEOPLE that he pitched in on meetings, prepped for shoots and helped review dailies on the drama Jolie directed for Netflix, based on her friendLoung Ung’s memoirabout surviving the Khmer Rouge genocide inCambodia.

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Learning on set

Angelina Jolie with son Maddox Jolie-Pitt and book author Loung Ung on set ofFirst They Killed My Father.Pax Jolie-Pitt/Netflix

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In 2016, Maddox worked as an executive producer on his mother’s film,First They Killed My Father.

Maddox previously told PEOPLE that he pitched in on meetings, prepped for shoots and helped review dailies on the drama Jolie directed for Netflix, based on her friendLoung Ung’s memoirabout surviving the Khmer Rouge genocide inCambodia.

04of 06Supporting his motherAlberto E. Rodriguez/GettyMaddox and Jolie stepped out in Sept. 2017 to premiereFirst They Killed My Fatherat the Toronto International Film Festival.

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Supporting his mother

Alberto E. Rodriguez/Getty

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Maddox and Jolie stepped out in Sept. 2017 to premiereFirst They Killed My Fatherat the Toronto International Film Festival.

05of 06On the circuitJames Devaney/Getty ImagesMaddox, his brother Pax and Jolie at the New York City premiere of her filmFirst They Killed My Father.

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On the circuit

James Devaney/Getty Images

Maddox Jolie-Pitt, Angelina Jolie and Pax Jolie-Pitt

Maddox, his brother Pax and Jolie at the New York City premiere of her filmFirst They Killed My Father.

06of 06All grown upGeorge Pimentel/WireImageNow at 18, Maddox is set to start classes at South Korea’s Yonsei University where he will be studying bio chemistry, a source exclusively tells PEOPLE.His mom is “very proud,” according to the insider.

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All grown up

George Pimentel/WireImage

2017 Toronto International Film Festival - “First They Killed My Father” Premiere

Now at 18, Maddox is set to start classes at South Korea’s Yonsei University where he will be studying bio chemistry, a source exclusively tells PEOPLE.

His mom is “very proud,” according to the insider.

source: people.com