"When We Were Young" is the second and final single by British pop group Take That from the band's first EP, Progressed. It acted as the theme song in the feature film adaptation of The Three Musketeers, which premiered in the United Kingdom on 14 October 2011. The song is the last to feature Jason Orange and Robbie Williams and features Robbie Williams and Gary Barlow on lead vocals. The single was released to radio on 11 July 2011 and was released in the United Kingdom as a digital download on 22 August 2011.

On 7 July 2011, it was announced on Take That's official website that "When We Were Young" would be the next single from Progressed, and that it would also serve as the theme song for the new film adaptation of The Three Musketeers, directed by Paul W. S. Anderson. Gary Barlow stated that the song was written after Take That watched a private screening of the film. Barlow stated "The film is visually so rich and beautiful that our main challenge was to then match it musically. We've returned to guitars, real pianos and a conventional song structure to achieve this. We also thought that the Musketeers reminded us of ourselves."

In his review of Take That's Progressed, Gavin Martin of The Daily Mirror concluded that "the trad Barlow ballad setting of 'When We Were Young' ... extends the original album's balancing act between dignified nostalgia and commercially crafted experimentation." Music News Daily gave the song a positive review stating that it "is a song best listened to when in a reflective mood. Williams takes lead vocals duty once more, with Barlow again on 2nd lead. It’s a beautifully crafted song, which is bound to evoke bitter-sweet memories for listeners and it deserves to be a huge hit."Heat praised the song by stating that "When We Were Young kicks the album off in a mid-tempo way, with a very catchy intro. It comes with a big chorus and is a bubbling mix of TT old and new."

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