WE CAN age as little as five years before face-recognition algorithms begin to struggle to identify us as the same person. This means systems that rely on facial recognition may need to get new images of users more often. Face recognition is now used at border crossings, by police to watch for known offenders in public and even to unlock our phones. But there has been little research on how such systems cope with faces changing over time. So, Marcel Grimmer at the Norwegian University of Science and Technology and his colleagues designed a test to assess this.
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