What's the average lifespan of a German shepherd mix?

I have a German shepherd/ Irish setter mix. I looked it up on a few sites and I think Irish setters have longer lifespans than Germans. My dog is 8 this year and I'm getting more and more scared because some say Germans only live between 10-12. If my dog is a mix between these two breeds how long would you estimate his lifespan is? Thank you thank you thank you!