Act Your Age may refer to:

• "Act Your Age" (House), an episode of the American TV series House
• "Act Your Age" (Phineas and Ferb), an episode of the American TV series Phineas and Ferb
• Act Your Age (radio series), a BBC Radio 4 panel game hosted by Simon Mayo
• Act Your Age (TV show), an TV show on the network Bounce TV

• Act Your Age (Home Grown album)
• Act Your Age (Gordon Goodwin's Big Phat Band album)
• "Act Your Age" (song), a song by Bliss n Eso
  • "Act Yr Age", a 2011 single by Bluejuice, sampled in the Bliss n Ego song.
• "Act Your Age", song by The Four Esquires 1959