Miyagino Nishikinosuke (宮城野 錦之助, 1744 – July 18, 1798) was a Japanese sumo wrestler. His highest rank was sekiwake. He was an active top makuuchi division wrestler at the age of 52, which is the all-time recognized record.
Source: “Miyagino Nishikinosuke”, English Wikipedia (CC BY-SA 4.0), excerpt