Who has the highest ranking black belt?

The oldest I'm personally aware of is GM Cacoy Canete of Doce Pares Eskrima/Eskrido - a Filipino martial art. GM Cacoy was born in 1919. I'm guessing there are some older black belts in the world but he is the oldest I'm aware of and there wasn't an answer here yet.

One thing I would request for this subject is that we actually build a list of these "young at heart" black belts. Katsuya Miyahira, 10th Dan, was born on August 8, 1918 in Kaneku Village, Nishihara, Okinawa. He is the head of Shido Kan Shorin Ryu.