Louis, Zayn, Liam, Niall, Harry - that's oldest to youngest in One Direction.
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Harry styles is the youngest in one direction. Kaitlin Kirkpatrick
niall
Oldest to youngest: Louis Tomlinson, 21 Zayn Malik, 20 Liam Payne, 20 Niall Horan, 20 Harry Styles, 19 (ages may vary by date, right now when im typing this it's 9/14/13)
Youngest
No, Roc Royal Is The Youngest Out Of The Group Prodigy Is The Oldest Then Rayray Is The Second Oldest Then Princeton IS The Third Oldest :)