They were certainly available, I think the cafeteria in my college dorm had them, and the army pretty much always had grapefruit available at breakfast, but I would not be surprised if I never ate one from 16 on. I guess it kind of makes sense, I don't like citrus with coffee or milk and those end to be my morning drinks, and juice was usually something I'd have in the afternoon after a workout or evening with booze in, though grapefruit juice is as normal in my fridge as OJ. I guess bananas, or raisins in oatmeal, have become my morning fruits.