In addition to meeting the eligibility requirements of RCW 74.08.025, an applicant for old age assistance must be an applicant who:
(1) Has attained the age of sixty-five: PROVIDED, That if an applicant for old age assistance is already on the assistance rolls in some other program or category of assistance, such applicant shall be considered eligible the first of the month immediately preceding the date on which such applicant will attain the age of sixty-five; and
(2) Is a resident of the state of Washington.