Appointing a trustee or director - FAQ
Must the Appointee be 18 years or older?
In short, yes.  A person under age 18 cannot be appointed as a trustee or as a director.

Can the Appointee be a bankrupt?
In short, no.  The Appointee cannot be a bankrupt.  Further the Appointment cannot be an insolvent under administration.

If the Appointee ceases to be a bankrupt (ie is a discharged bankrupt) or ceases to be an insolvent under administration, then Appointee could be appointed as a trustee or as a director.