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Any auto-confirmed user (logged in users with either 10 edits or with an account with over 3 days of activity in this wiki if I'm not mistaken) can edit infoboxes. You yourself have already edited infoboxes. There are no indications that Naruto is already 17. The last concrete given age he received was when he said he was 16 when he met Kushina while learning to control the Nine-Tails. We don't know how far along his 17th year he is, so there's no way to tell if he actually completed 17 years already. Omnibender - Talk - Contributions 02:09, March 20, 2013 (UTC)
If you look at his birthday, he was born on October 10th, 1995. In 2012, which just recently passed, he became 17. I don't really think that someone in the manga has to mention it for it to be exact. But you know what, I guess it doesn't really matter much. I still think it's better if you change it to 17 though. Thanks.--Tails of Uzumaki Pride (talk) 22:51, March 20, 2013 (UTC)