12 Young persons exert very important influence in modern society. There has been a radical change in the circumstances of their lives, their mental attitudes, and their relationships with their own families. Frequently they move too quickly into a new social and economic status. While their social and even their political importance is growing from day to day, they seem to be unable to cope adequately with their new responsibilities. Their heightened influence in society demands of them a proportionate apostolic activity, but their natural qualities also fit them for this activity. As they become more conscious of their own personalities, they are impelled by a zest for life and a ready eagerness to assume their own responsibility, and they yearn to play their part in social and cultural life. If this zeal is imbued with the spirit of Christ and is inspired by obedience and love for the Church, it can be expected to be very fruitful. They should become the first to carry on the apostolate directly to other young persons, concentrating their apostolic efforts within their own circle, according to the needs of the social environment in which they live. Adults ought to engage in such friendly discussion with young people that both age groups, overcoming the age barrier, may become better acquainted and share the special benefits each generation can offer the other. Adults should stimulate young persons first by good example to take part in the apostolate and, if the opportunity presents itself, by offering them effective advice and willing assistance. By the same token young people should cultivate toward adults respect and trust, and although they are naturally attracted to novelties, they should duly appreciate praiseworthy traditions.
Source: Apostolicam Actuositatem (Vatican.va)