55 Pa. Code § 148.31 – Noninstitutionalized persons 21 years of age or older.

A person who is 21 years of age or older is considered a resident of this Commonwealth if the person meets one of the following requirements:

(1) Lives in this Commonwealth with the intent to remain permanently, or for an indefinite period.
(2) Lives in this Commonwealth as a result of moving here with a job commitment or to seek employment, whether or not currently employed.
(3) Lives in this Commonwealth and is incapable of indicating intent under § 148.71 (relating to determination of a person’s incapability to indicate intent).