18 year old Steven Morton was last seen leaving his residence in Glebe Sydney with his cousin on Friday 7 July 1978.
Steven's vehicle was later located around the Coledale area, near Wollongong NSW. Family and friends have not seen him since this time. Police hold grave concerns for his welfare.
Anyone with information which may assist in locating Steven is urged to call Crime Stoppers on 1800 333 000.