confinement The term solitary confinement means confinement of an inmate in a correctional facility, pursuant to disciplinary, administrative, protective, investigative, medical, or other classification, in a cell or similarly confined holding or living space, alone or with other inmates, for approximately 20 hours or more per day, with severely restricted activity, movement, and social interaction. (3) Vulnerable person The term vulnerable person means any inmate who— (A) is 25 years of age or younger