Jacob McGrotty was last seen at Hamilton Square train station in Birkenhead on Monday December 23.
He is known to frequent the Southport, Blackpool and Wigan areas.
He is described as a white male, 5ft 7in tall, of slim build with short dark brown hair and a tanned complexion.
When last seen he was wearing dark grey jogging pants, a black puffer jacket with a hood, a grey beanie hat and black trainers.
Anyone who has seen Jacob or knows of his whereabout is asked to DM @MerPolCC, call 101 or contact @missingpeople on 116 000.