You know, our grandparents said that about us. Just ask Archie and Edith.
I've mentioned it before, but my favorite podcast of all time was Dan Carlin's Hardcore History. It's waned a bit, but one of the better episodes from a few years back was called, "Old School Toughness". The basic premise is him thinking and talking through the scenario of how any generation might hold up in a war against their grandparents, with the initial thought being that the younger generation would probably have their asses handed to them. Of course, he works through the problem in bloody detail, the way only Dan Carlin can, with great historical reference to the Greatest Generation, etc.