This subtitle applies to:
(1) A fiduciary acting under a will or power of attorney executed before, on, or after October 1, 2016;
(2) A personal representative acting for a decedent who died before, on, or after October 1, 2016;
(3) A guardianship proceeding, whether pending in a court or commenced before, on, or after October 1, 2016;
(4) A trustee acting under a trust created before, on, or after October 1, 2016; and
(5) A custodian if the user resides in this State or resided in this State at the time of the user’s death.