Well, he did live for 63 years after the war. Depending on how much suffering he, his wife and son endured, I'd say he was probably lucky.

http://www.guardian.co.uk/world/2009/mar/25/hiroshima-nagasaki-survivor-japan

"I can't understand why the world cannot understand the agony of the nuclear bombs," he says, speaking through his daughter. "How can they keep developing these weapons?"
http://en.wikipedia.org/wiki/Tsutomu_Yamaguchi