3TR in the Gippsland region targeted a young audience when it was on AM & continued to do so when it moved to the FM band in 2002, with the AM station becoming 3GV (now Gold 1242). 3GG was similar before Sea FM (later Star FM, now Hit) started that same year.
4AK in the Darling Downs is probably the last remaining commercial AM station to target a young audience.