Society would take more than just youth for it to change simply because the world is so large it would require a great deal of people to change at once. It will require years and years of hard work and slowly understanding what is wrong with society for each person to change.
Youth can be spontaneous and over eager to prove themselves, but no one demographic can change the world be themselves. It is my firm belief that as the old adage says, united we stand and divided we fall. If the young, Old, working, non-working, sick, and healthy alike do not make a stand for what is right and what change needs to take effect we are all doomed to fail.