This 2014 primate study provided additional details on the specialized brain circuits for recognizing faces:

“The current finding that neurons commonly give similar responses upon seeing the same faces months apart raises the possibility that some neurons might respond the same way to the same individual faces over most of the animal’s lifespan.”

But the finding could also have been:

“Another example of a biological system maintaining its complex organization as the constituent components are exchanged.”

http://www.pnas.org/content/111/22/8251.full “Face-selective neurons maintain consistent visual responses across months”