Surely one of the world's youngest photojournalists: By 1968, 12-year-old Lo Manh Hung (aka Jimmy) was already a seasoned photographer, following his photojournalist father into some of the Vietnam War's most dangerous situations.
BBC video (14 min.):
https://www.bbc.com/reel/video/p0lrkv9t/the-incredible-story-of-the-world-s-youngest-photojournalist