Not a sign of aging, but more a sign of maturity. When one realizes that every casualty in WWII be it Nazi, Imperialist Japanese, or Fascist Italian, had a mother, father, probably siblings, possibly a spouse and children of their own the corner has been turned. Even when we, as members of a western and free society observe the Japanese or SS soldier without hatred and contempt but rather someone bleeds just like we do, morns like we do, is proud of their country like we are, etc, then we have turned the corner and can move and understand that we are not that much different and can go on with learning how to prevent such travesties from happening again.
"As long as voices are heard and pencils move the guns stay silent"
Being able to watch combat films of WWII and think beyond which plane, or tank, or ship is firing or being fired at and instead think of the horror those men went through at that point in time simply means that your mind has matured to think much picture than the picture shows.