Lots of us are bad with remembering names, but can still pick out a past colleague or old flame when they pop up on social media. However, a new study from Harvard University has found that up to 5.42 per cent of people struggle with the opposite problem. 'Prosopagnosia', or face blindness, is a disorder that makes you unable to recognise faces you've seen before, including those of friends and family. It can also result in you being unable to identify yourself in pictures or the mirror, or feeling like you know complete strangers. Last year, Brad Pitt detailed his experience with the condition, admitting that'nobody believes' him when he talks about it.

"I never forget a face", "She's got an honest face", "You could see it in his face", and "She looks young for her age" are just a few of the often-used phrases suggesting that faces are important for our interactions with other people and what we think we know about them. But can people really remember faces as well as they think they do, and can we really tell someone's age from their face? Or can artificial intelligence (AI) do it better? And can we really tell if someone is trustworthy just by looking at their face? Research shows that humans exhibit a wide range of facial recognition abilities.

"I never forget a face", "She's got an honest face", "You could see it in his face", and "She looks young for her age" are just a few of the often-used phrases suggesting that faces are important for our interactions with other people and what we think we know about them. But can people really remember faces as well as they think they do, and can we really tell someone's age from their face? Or can artificial intelligence (AI) do it better? And can we really tell if someone is trustworthy just by looking at their face? Research shows that humans exhibit a wide range of facial recognition abilities.