"Young Blood" is a song by English recording artist Sophie Ellis-Bextor from her fifth studio album Wanderlust (2014). The song was released as the album's lead single on 21 November 2013. It was co-written by Ed Harcourt and Ellis-Bextor; the former also produced it. The song is a chamber pop piano ballad, which features instrumentation from subdued drums and various string instruments. In the track, Ellis-Bextor sings with restrain, incorporating a low register in the verses and hitting her highest note in the chorus. A demo version of the track was offered online in March 2013.

"Young Blood" received mostly positive reviews from music critics, who complimented Ellis-Bextor's vocals and the song's tenderness. The song became her first single to enter the UK Singles Chart since her 2011 single "Bittersweet". On its component UK Indie chart, the track peaked within the top five. Sophie Muller was commissioned to direct its video, which shows Ellis-Bextor on a pier and inside a living room. The song was performed on some television programmes in the United Kingdom.

As with the rest of Wanderlust, "Young Blood" was composed by the English musician Ed Harcourt, with additional songwriting from Ellis-Bextor. It was recorded at the State of the Ark studios, mixed and engineered by Richard Woodcruft, and mastered by Miles Showell. It is a chamber pop piano ballad, with a viola, a violin, muffled drums, a cello and a double bass.

According to the sheet music published by Universal Music, it is set in a tempo of 60 beats per minute. It is written in the key of F major, and its verses follow the chord progression B♭mai₇—F. The song begins with a gentle piano melody, transitioning into Ellis-Bextor's sung section. During the verses of the song, she sings in a low register, reaching her lowest note of F₄; conversely, in the chorus, her voice reaches C₆ and trembles. Throughout the song, her vocals are restrained and incorporate the melisma technique. The bridge of the song features "choral harmonies". The song's lyrics are written in first and second-person narrative, following the common verse–chorus form. According to Ludovic Hunter-Tilney from Financial Times, the track discusses "the joys of growing old with one's spouse".

...
Wikipedia