An appeal has been launched to help trace Stephen Cullinan - from Nenagh, Co Tipperary - who is missing from Castletroy in Co Limerick since Friday 3 November.
Stephen is described as 1.8 m (5ft 11in) in height, of medium build with short fair hair.
He was last seen wearing a hoodie and jeans and wears glasses and there are concerns for his well-being.
Gardaí at Henry Street are investigating this incident and are seeking assistance from the public in establishing the location of Stephan.
Anyone with information is asked to contact Henry Street Garda Station on 061-212-400, the Garda Confidential Line on 1800-666-111, or any garda station.