An individual may apply to serve as a VISTA if all the following requirements are met:
(a) The individual is at least eighteen years of age upon taking an oath or affirmation, as appropriate, to enter VISTA service. There is no upper age limit.
(b) The individual is a United States citizen or national, or is legally residing within a state. For eligibility purposes, a lawful permanent resident alien is considered to be an individual who is legally residing within a state.