This Part applies to every person, either male or female, 18 years of age or over, but under 21 years of age, who is, or who may become, entitled to any rights or benefits under the laws of the United States relating to veterans benefits. (1945, c. 770; 1967, c. 1060, s. 3; 2015-241, s. 24.1(f); 2015-268, s. 7.3(a).)