Hotel: Ho-shi Ryokan                 (1291 years old)
Restaurant: St.Peter                    (1205 years old)
Wine producer: Goulaine              (1008 years old)
Brewery producer: Weihenstephan  (968 years old)

Glass producer:Barovier&Toso        (713 years old)
Ceramics producer:Sommerhuber   (517 years old)
Pottery producer:Ubaldo Grazia      (508 years old)
Porcelain producer:Royal Delft        (355 years old)

Bank:Monte dei paschi di Siena     (536 years old)
Bank:Berenberg                           (418 years old)
Bank:Wegelin                              (267 years old)

Jeweler:Mellerio                            (395 years old)
Knives maker:Zwilling J.A.Henckles  (277 years old) 
Watch maker:Favre-Leuba              (271 years old)
 

These businesses appear quite often: hotels, farms, brewery, wine, sake, restaurant, porcelain,distillery, jeweler, watches,banks

Here is list of oldest companies in the world:
http://en.wikipedia.org/wiki/List_of_oldest_companies