I don't know how old the one in the ad is, I would expect around 1965, judging by the woman's suit, which I really like, so I was very young, but around. They are a favorite of mine. GE would probably be my second range choice besides a (GM) Frigidaire.
GE made these for years, in fact they may have even extended into the 80s. Some later ones had a microwave on top instead of another oven, but I'd rather have the extra oven. A neighbor had an avacado green one with that had the small buttons up near the upper oven to control the burners.