Niall Horan, Zayn Malik, Liam Payne, Harry Styles and Louis Tomlinson were mere children when they auditioned for The X Factor in 2010, with the exception of Louis, who was just 18. These boys literally have been working ever since the day they tried out, hardly sleeping, travelling the world, and forming fierce friendships. According to One Direction: This Is Us, they have barely seen their families as they’ve aged into adulthood – and this is what’s so riveting about this documentary, which is also known as 1D:3D.