Face blindness is a neurological condition that affects an individual's ability to recognise familiar faces.

Approximately 2% of people are faceblind.

I feel it is important to mention that I am one of them. 

I usually rely on other cues to recognise people, such as their voices or body language.

You can read more about face blindness here: 

faceblind.org.uk

neural.org.uk

troublewithfaces.org