If you're anything like us, you've been playing around with Microsoft's how-old.net desktop app all morning. The results were pretty hilarious and we thought we'd ask the site how old our favourite musicians were.
Liam Payne (21), Niall Horan (21), Harry Styles (21), Louis Tomlinson (23)
Demi Lovato and Charli XCX
Charli XCX (22), Demi Lovato (22)
Justin Bieber and his sister actual mom