Re: Where are the oldest aikido dojos in the world?
The first shibu dojo (branch dojo) of the Aikikai is Kuwamori Dojo, from 1951.
Previous to this, there were a number of 'independent dojo set up by Ueshiba's disciples - I don't have dates, but you would have Kobayashi Hirokazu, Tanaka Bansen, Iwama, Shingu, Takaoka's dojo maybe Iwata Ikkusai . . .