Everyone was upset and/or asking about published teenage authors a while back. I now have a list of about five and their blogs if they have them (or links to their writings).
Cayla Kluver (16), author of Legacy and Allegiance (third book to come): Blog
Alexandra Adornetto (17), author of Halo (there's probably other books in the series by now).
Amelia Atwater (14), author of a lot of books (too many to name): Blog
Flavia Bujor (15), author of The Prophecy of the Stones: A Novel: Amazon
Steph Bowe (16), author of Girl Saves Boy: Blog
And those people are the ones that published closest to my own age. There's a lot of 18-19 published young authors too, but I felt the need not to include them because I'm cruel like that. Now, those people are probably about 18+ by now, but they published at the ages I put in brackets. :) Hope you enjoyed this!