Young people, as a general rule, rebel against revered institutions more than old people. But we are talking generalizations, and your mileage may vary. Let's put it this way, I believe that if you had 100 privileged youths and their 100 privileged parents, the parents would be more respectfully of the flag/whatever on average. If you had 100 working class youths, and their working class parents, the parents would be more respectful on average.
But I can't prove that to you, so feel free to believe that age doesn't matter.