Publish a paper with a coauthor not affiliated to a university I am supervising a last year high-school student (a very advanced one) who is doing some kind of a research project. He does some numerical simulations on problems that I suggest. If everything goes well the results of these simulations should be rather interesting and could be submitted to a reasonable journal. 

I have an affiliation with a renowned university but the student obviously does not yet have any. Next year he plans to enter university X (and probably he can do that).

The question: can I submit a paper with him as a coauthor, stating that he is affiliated to the university X? May it create some problems for the student if he choses to enter another university Y later?
I published a paper with two high school student co-authors.  I listed their high school as their affiliation.  They were not paid by the university.  It worked fine.