Feeling nostalgic? These photos will bring you back to what life was like in the world of fast food in the 1980s.

But what’s the oldest chain restaurant? What’s the oldest fast food chain? We’ve compiled some of the most popular and a few of our favorites—all of which are at least 40 years old.

(Check our buying guide and Ratings for fast-food restaurants, and look at our gripe-o-meter to see what bugs Americans when they dine out.) That's according to Consumer Reports' latest fast-food ...