When is Jack Spicer 's birthday from Xiaolin Showdown?

Well, it's obvious that he's under the age of 18 from what he says about him being a "boy" genius. But that also means he's over the age of 7 from what he said about him dreaming about world domination since he was in the second grade, with the average age for 2nd grade is 7. So I have to say he's at least 13 to 15 years of age...