Nassau police are looking for a missing 15-year-old who was last seen last Friday in Syosset, authorities said Thursday.

Jaeden Gandia was spotted leaving MercyFirst, a facility offering residential, foster care and other programs, on Convent Road around 3:10 p.m.

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He stands 5 feet tall, weighs 168 pounds and has brown eyes and brown hair, police said. The teenager was last wearing a black or gray hooded sweatshirt and black pants.

Authorities encourage anyone with information on Jaeden’s whereabouts to contact the Missing Persons Squad at 516-573-7347 or call 911. Callers are anonymous.