New York Consolidated Laws, Mental Hygiene Law - MHY § 67.03 Residents

(a) For the purposes of this article any person who resides in the state continuously for one year, and any person under the age of sixteen or any person with a developmental disability whose parents or persons having legal custody of him have resided in the state continuously for one year, shall be considered a state resident.  Residence so acquired continues until the resident has remained away from the state for one year.

(b) No person shall lose state residence through absence from the state while serving in or attached to the armed forces of the United States or the United States Merchant Marine and no member of the family of any such person shall lose state residence through absence from the state while living with or near such person during the period of service.

(c) The continuous residence required to become a resident does not include any period during which a person was residing on a military reservation, but periods of residence immediately before and after the period of residence on a military reservation, if equaling one year, shall satisfy the required period of continuous residence.