34-13-118 may be changed under this section only if the

34-13-118 may be changed under this section only if the governing will, trust or nomination provides in substance that the custodianship is to continue until the minor's attainment of a specified age, which time shall not be later than the minor's attainment of thirty (30) years of age, and in that case the governing will, trust or nomination shall determine the time to be specified in the transfer pursuant to W.S. 34-13-122.

(d) The time for transfer to the minor of custodial property transferred by irrevocable gift or the irrevocable exercise of a power of appointment under W.S. 34-13-117 may be changed under this section only if the transfer pursuant to W.S.