Youth has a very important role to play for society. For that we need to know why youth are so special. It is so because they are young, full of energy and educated with rationality as their ultimate belief. Now their role in society.
The first is reproduce. Reproduction here does not mean increasing the population but it means that they full fill the position left by the elder. Like son takes up the position of father in a company.
The second is protection. Youth are expected to protect their culture and tradition while at the same time makes it better and embrace changes in the society. For instance it is youth only who becomes a part of political movement for a major change in a country. They becomes a part of armed forces too, to safeguard the freedom of people and so on.
And the last is growth. The growth of a country in all the spheres like Social, political and economic spheres mostly depends on youth only. They with a fresh energy can perform better and ensure the growth of society.
There are many other roles of youth in the society. They are like the leading character of a movie. Youth also need to take care of old ones who are now going to be dependent.