La. R.S. 9:2252

Trusts heretofore created and any provisions or dispositions therein made shall be governed by the laws in effect at the time of their creation. Unless otherwise provided in the trust instrument, trusts created prior to the effective date of this Code shall be governed in all administrative and procedural matters by the provisions of this Code and not by laws in effect at the time of creation of such trusts, and trusts created prior to the adoption of any amendment to this Code shall be governed in administrative and procedural matters by the provisions of the amendment.