The 22-year-old posted this hilarious snap of himself alongside Niall Horan from boyband One Direction with the two looking like old-age pensioners.
In a tweet, Capaldi, from West Lothian, joked: "I look like Paul McCartney if he was really ill."
The #AgeChallenge "challenges" you to upload an image of yourself with the FaceApp's filter applied.
Dozens of celebrities including Gordon Ramsay, Piers Morgan and rapper Drake have jumped on the bandwagon to share pictures of what they may look like decades in the future.
Capaldi is no stranger to a joke and a wind-up. At the TRNSMT Festival on the weekend, the singing sensation wore a Chewbacca mask after Noel Gallagher compared him to the Star Wars character.Capaldi donned the mask for his set on the main stage in front of around 50,000 people in Glasgow Green.