The wikipedia article derives its information from the following interview, which is the only source referenced:

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This interview simply states that Adam is 17. The writer of the Wikipedia article has therefore subtracted 17 from the year of the interview to deduce his age. But what if his birthday comes after the date of the interview? The writer of the wikipedia article has simply ignored this possibility.

It is essential to exercise some critical faculties when it comes to information from 'the internet'. The internet is not infallible; it is not a god. Wikipedia is not a god; IMDb is not a god... Dear me, what is to become of this younger generation?

There are some interesting things in the interview, and I've added a link to it to Adam's profile page.