CA Prob Code Section 6100

(a)

An individual 18 or more years of age who is of sound mind may make a will.

(b)

A conservator may make a will for the conservatee if the conservator has been so authorized by a court order pursuant to Section 2580. Nothing in this section shall impair the right of a conservatee who is mentally competent to make a will from revoking or amending a will made by the conservator or making a new and inconsistent will.