A deed or will or other writing purporting to create, terminate, or affect an interest in real or personal property is presumed to be authentic if it:
(a) Is at least 30 years old;
(b) Is in such condition as to create no suspicion concerning its authenticity;
(c) Was kept, or if found was found, in a place where such writing, if authentic, would be likely to be kept or found; and
(d) Has been generally acted upon as authentic by persons having an interest in the matter.
(Enacted by Stats. 1965, Ch. 299.)