"Not Nineteen Forever" is the fourth single released by indie rock band The Courteeners. Taken from their debut studio album St. Jude, it was released on 31 March 2008 on a CD and two 7" singles. It reached #19 in the UK Singles Chart making it the highest charting Courteeners single to date. It was most recently used as Manchester United's record breaking 20th title winning song. The song is featured on Pro Evolution Soccer 2010.

The single was released on 31 March 2008 as both a CD single and as two alternate 7" singles. It managed to enter the UK Singles Chart at a peak of #19, making it 'The Courteeners' most successful single to date.

The lyrics concern a conversation between a young man and his older girlfriend, who is disappointed by his wild and hedonistic behaviour that night, and she drives him for 'tea and toast'. He flirts with her in the car, but she reminds him he's only young and needs to get his life together. He goes out again and chases another woman, but she disappears before he can make conversation. He muses about how she probably wasn't worth chasing before understanding his girlfriend's words.

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