Our culture treats youth with very soft gloves. Not much is expected, not much is required.
I believe that the youth have it in them to be responsible and productive, they just need to be given the opportunity. They will rise to the occasion when there is a need.
Suppose that in one instant everyone in the world 20 years and older perishes. Would civilization cease to exist? No! The youth would take responsibility and get organized. They would work together to ensure the continuation of food production, caring for the young, and forming governments.
We can ask much more of our youth. They like responsibility. They like to be trusted and counted on.
And they do come through.