that's really just not true. Plenty of younger guys survived, they'd pretty much all had the same training as the 30yr olds if they'd been conscripted at outbreak of war.
He probably meant the re-inforcements which included old men and young kids without any combat training or experience at all.
Afaik, the regular German and Russian troops were very well trained units. But their replacements were sometimes not really capable of meeting the expectations.
But I guess that the same thing also applied to US/GB allied troops who had very well trained troops, but the reinforcements were just cannon fodder, and usually didn't last very long in battle.
Due to the pressure of war training was rushed, and shortened to a minimum. So the soldiers who were trained during war usually did not have much survival chances. Those trained before the war were the ones with a lot more experience, and very often much better physical, and mental condition.
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