The theme the pope chose for the 2012 celebration was "Educating Young People in Justice and Peace."
He asked parents and teachers to be more attentive to the hopes and fears of young people today and to their search for true values, and he asked governments to put more resources into education and job creation.
And the pope asked young people themselves to take their schooling seriously and to be open to the example and knowledge their elders have to share.
He asked them "to be patient and persevering in seeking justice and peace, in cultivating the taste for what is just and true, even when it involves sacrifice and swimming against the tide."
Adults have a serious responsibility to help the young fulfill their potential, not just by sharing information with them, but by being examples of what it means to live lives marked by the joy of faith, charity and respect for others, he said.
"Today more than ever we need authentic witnesses, and not simply people who parcel out rules and facts: We need witnesses capable of seeing farther than others because their life is so much broader," the pope said.
Educating people in justice and peace begins in the family, where they learn to value the gift of life, solidarity, respect for rules, forgiveness and hospitality, he said.
Too many young people today are missing that basic human formation because "we are living in a world where families, and life itself, are constantly threatened and not infrequently fragmented," he said.
Pope Benedict appealed to parents to give their children "the most precious of treasures," which is the gift of their time.
The pope also urged governments to make it possible for parents to choose the type of education they want their children to receive and to enact immigration reforms aimed at "reuniting families separated by the need to earn a living."
Presenting the message at a Vatican news conference, Cardinal Peter Turkson, president of the Pontifical Council for Justice and Peace, said the pope's message highlights the fact that he sees young people not only as hope for the future, but as "an active part, the most vital part of the human family" in a world that needs energy and new ideas now.
Bishop Mario Toso, secretary of the justice and peace council, said the young people who energized the Arab Spring movements toward democracy this year illustrate the fact that the young have a positive role to play in society today.
They proclaimed to the world that "there can be social justice in their societies if there is democracy and, vice versa, that if there is democracy, there can be social justice," he said.
The heart of the pope's message focused on what he called the "integral formation of the person, including the moral and spiritual dimension."
"Man is a being who bears within his heart a thirst for truth -- a truth which is not partial, but capable of explaining life's meaning -- since he was created in the image and likeness of God," the pope wrote in his message.
Acknowledging God as creator leads to recognizing "one's own profound dignity and the inviolability of every single person," Pope Benedict said.
Based on that dignity, people come to understand that there are certain things that always are either right or wrong, he said.
"Deep within his conscience, man discovers a law that he did not lay upon himself, but which he must obey. Its voice calls him to love and do what is good, to avoid evil and to take responsibility for the good he does and the evil he commits," the pope said.
Pope Benedict said peace is not simply a gift to be received from God, it is a task people of good will must undertake.
"In order to be true peacemakers, we must educate ourselves in compassion, solidarity, working together, fraternity, in being active within the community and concerned to raise awareness about national and international issues and the importance of seeking adequate mechanisms for the redistribution of wealth, the promotion of growth, cooperation for development and conflict resolution," he said.