(a) A conviction under Chapter 21, Section 20A.02(a)(3), (4), (7), or (8), Section 22.011, or Section 22.021, Penal Code, is supportable on the uncorroborated testimony of the victim of the sexual offense if the victim informed any person, other than the defendant, of the alleged offense within one year after the date on which the offense is alleged to have occurred.
(b) The requirement that the victim inform another person of an alleged offense does not apply if at the time of the alleged offense the victim was a person:
(1) 17 years of age or younger;
(2) 65 years of age or older; or
(3) 18 years of age or older who by reason of age or physical or mental disease, defect, or injury was substantially unable to satisfy the person's need for food, shelter, medical care, or protection from harm.