I have been told by people that they had a 16 year old and that is the oldest I have ever heard of. I would assume that since they are medium-large sized dogs that they might live somewhere between 12-16 years.
That is funny that that is how people with little dogs react to your dogs too.
Aurora LOVES little dogs because she grew up with a dachshund named Abby. When the dachshund passed away we got Pasha because Aurora was very sad. Well every time we go to the dog parks near us and a little dog shows up Aurora charges it to say hello and almost every time the owners freak out and pick their dog up. I usually have to reassure them that Aurora is just excited because she loves little dogs and that she is extremely friendly (will lick the dog for hours if allowed).
I have at least one person come up to me every time we go somewhere public and ask if they can take a picture of my pups. Usually I oblige, but if someone just takes a picture without asking I usually say something...