Indeed. What worries me is how deeply dependent that peace has been on policymakers having living memories of how terrible World War 2 actually was, and of how Hiroshima and Nagasaki pointed to the possibility that World War 3 could be even worse. Several times during that long peace the U.S. and the Soviet Union came to the brink of war, only to be pulled back by leaders on both sides who remembered the horrors the war unleashed and didn't want to see them unleashed again.
President John F. Kennedy and Soviet Premier Nikita Khrushchev, for instance, had both seen the war first-hand -- Kennedy in a PT boat in the Pacific, Khrushchev as a political commissar in the struggle against the Germans on the Eastern Front. When the Cuban Missile Crisis was at its height, Khrushchev explicitly called on Kennedy to let those experiences guide him to step back (http://www.archives.gov/publications/prologue/2012/fall/cuba...):
Mr. President, we and you ought not now to pull on the ends of the rope in which you have tied the knot of war, because the more the two of us pull, the tighter that knot will be tied. And a moment may come when that knot will be tied so tight that even he who tied it will not have the strength to untie it, and then it will be necessary to cut that knot. And what that would mean is not for me to explain to you.
So the question is -- what happens when everyone who carries those memories is long dead? When the leaders only know what war, real war, is from dusty history books and rah-rah action movies? Will they be as willing to swallow their pride in order to pull back from the brink as those who already lived through it once were?