IF taught properly, they would be able to fly 'em, but the training budgets would go out the window.
It would be interesting to watch a brand new F/O with low hours (as found today at many European air carriers) have a go...these folks adapt quite easily to a fancy FMS, but it should be remembered that they lack the necessary flying skills for these older jets and their handling problems.
I expect that if they followed the same training as you had, they would be able to fly them just as well. Pilots of your era were not genetically or biologically superior to pilots of today
But I would agree that if you pulled a pilot out of an Easybus and put him in a 707, he would struggle and might even crash. But I expect if you were put in a Sopwith Camel, you would also struggle and might even crash. This is a bit of an inane argument really!