I have to agree with all that has been said so far.

A few years back one of our translators was ready to start work on an 'adult' job we had and, in the process of getting her ready to start she told me her age.

We instantly stopped the work with her, paid her what sh would have gotten paid and hired someone else to do the work.

Its just not worth the potential legal hassles fo you or them in the long run.

Regards,

Lee