Rejuvenation clinic

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Doc after removing the prosthetic from his face.

"I thought you wouldn't recognize me Marty. I had an all natural overhaul."

—Doc

A rejuvenation clinic was a clinic where a number of years could be added to one's life, up to 30 or even 40 years. Dr. Emmett Brown was one who went through the process, doing so in 2015. Treatments included hair repair, changing his blood and replacing his spleen and colon. However, he thought he looked so youthful that he then added prosthetic makeup so that Marty McFly would recognize him.