"Backside of Thirty" is a song written and recorded by American country music artist John Conlee. It was released in February 1979 as the third single from the album Rose Colored Glasses. The song was Conlee's third country hit and second number one on the country chart. The single stayed at number one for a single week and spent a total of eleven weeks on the country chart. The song was originally recorded by Joe Stampley on his 1976 album, Ten Songs About Her.