I've heard 4th Gen stories of Cars that have gotten 300,000 miles on them and still ran okay.
I guess, like AirGoya said, it largely depends on how you treat it. Do you take it out in Winters often? Do you Power-shift, when you shouldn't?
My '79 Camaro is completely stock, never replaced anything, and it still runs with minor tune ups. But then again, it has only seen one winter, and it still has under 60,000 miles...
But in general, I would consider the Camaros of the past, and I expect the future model to be a very Well-put-together vehicle.