The capacity required to create, amend, revoke, or add property to a revocable trust, or to direct the actions of the trustee of a revocable trust, is the same as that required to make a will. Nothing in this section shall be construed to prohibit the creation of a revocable trust if that creation is otherwise authorized under State law. The fact that the settlor becomes incapacitated or loses the capacity required to create a will does not convert a revocable trust into an irrevocable trust.