Answer:
they are most dissatisfied with the world they are inheriting
Step-by-step explanation:
Generally, the youth might actually want to make changes because they don't like what is being handled to them. Specially when they feel like everything is a mess, or unfair in any way, they will most likely rebel. Adding it to the naturally rebellious behavior of youngsters, you have a pretty good idea of why they're generally responsible for counterculture.