"Times change and men decay"
Since the Greeks, the older generation has always decried the younger generation as weak, ill-informed, and just not up to snuff by the standards of "back in the day."
The truth is, most of my classmates are incredibly informed about current events. They can tell you not only where Kabul is, but also name all of the provinces of Afghanistan, Pakistan, and Iraq.
I think the majority of people have always been a little bit ignorant with regard to foreign policy. And the mean may be especially low today. But this is offset by the upper segment of the population that is better informed than their equivalent at any time in history.