s 21 Powers to make decisions and appoint deputies: minors
21.—(1) Subject to subsection (2), the powers under section 20 as respects any matter may be exercised even though P has not attained the age of 21 years, if the court considers it likely that P will still lack capacity to make decisions in respect of that matter when P attains the age of 21 years. (2) When deciding whether it is in P’s best interests to appoint a deputy to make decisions on P’s behalf, the court must have regard (in addition to the matters mentioned in section 20) to the principle that an appointment of the parents or guardian of P as deputy is to be preferred to the appointment of any other person as deputy.