As I read through this paragraph, it reminds me of the best of the post-conciliar years of the last century. We lost much of whatever ability we had to take risks. And taking those risks is essential not just for being young, but for staying alive.
37. Christ’s Church can always yield to the temptation to lose enthusiasm because she no longer hears the Lord calling her to take the risk of faith, to give her all without counting the dangers; she can be tempted to revert to seeking a false, worldly form of security. Young people can help keep her young. They can stop her from becoming corrupt; they can keep her moving forward, prevent her from being proud and sectarian, help her to be poorer and to bear better witness, to take the side of the poor and the outcast, to fight for justice and humbly to let herself be challenged. Young people can offer the Church the beauty of youth by renewing her ability to “rejoice with new beginnings, to give unreservedly of herself, to be renewed and to set out for ever greater accomplishments”.[Vatican II, Message to Young Men and Women (8 December 1965): AAS 58 (1966), 18]
Remember to check Pope Francis’ Post-Synodal Apostolic Exhortation on this link at the Vatican site.
Any comments?
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Catholic Sensibility 
While there are aspects of this that strongly resonate with my memories as a young child of the positive energy after the Council (my parents were not among the people whom Humanae Vitae upset), I do find it partakes of assumptions that are not only limited but time-bound/anachronistic. The youth generation(s) with whom waves of change were associated in the post-World War II era (in the USA, it was actually the ostensibly conformist Silent Generation that was at the forefront of the civil rights movements and movements to de-marginalize the differently-abled, and even the first wave of the peace-antiwar movements) also partook of disappointed expectations. And what happens when expectations are disappointed is that energy starts finding lesser agendas to fixate on while resentments get nurtured. (Just to speak to the progressive wing of Amurkan Catholic liturgy folk: I see a lot of conversations that have an odd energy as if they had merely come out of a thaw, that agendas that were thwarted could simply be picked right back up as if life had also been frozen and was only recently been thawed. It’s not only the traddies with this problem.)
Genuine hope =/= expectation, so it’s much less vulnerable to that.
Besides, not all youth generations are naturally and circumstantially endowed with the makings of an abundance of hopeful or expectant energies. Many members of youth generations grow up without much of those energies, or obvious cause for them. And those people may only become more hopeful as they enter into later stages of life.