Missing man was last seen at Gilfach Goch Social Club
South Wales Police are appealing for information to help them find Luke Button.
He was last seen at around 12.15am on August 25 at Gilfach Goch Social Club.
He is described as white, approximately 6ft 5in tall, of slim build, with short grey hair and a beard.
When he was last seen, he was wearing a blue and white shirt, light blue jeans and white trainers.
Anyone with information is asked to call the police on 101 with reference number 1900313250.