&What's My Age Again?& is a song by American pop punk band Blink-182. It was the first single released from the band's third album Enema of the State and the first to feature new drummer Travis Barker. The song, written by bassist Mark Hoppus, carries a theme about a protagonist who, despite being an adult, still behaves like a teenager.
Released in November 1999, &What's My Age Again?& became Blink-182’s second hit single, setting a precedent for most of the band’s further career. The song peaked at #2 on the Modern Rock Tracks chart as well as #19 on the Mainstream Rock Tracks chart. In October 2011, NME placed it at number 117 on its list &150 Best Tracks of the Past 15 Years&.
The album version continues the guitar outro from the previous track, &Going Away to College&, whereas the single version cuts the fadeout and simply opens with the song’s trademark opening notes. The single version appears on the band’s Greatest Hits compilation album.