Well it could be along the lines of...
Smallish
communes working through direct democracy, where children are free to run about, and just be curious, learning about life by living it, every adult being responsable for any of them.
And after a certain age they can leave the commune if they so desire, roam around seeking for another commune that might fit them better. All around there would be places such as an old style traveler's
Inn, like those in
India, but all required to provide free lodging and food for the young and old, and thus always having a place to eat and sleep and be with people, but not necessarily being dependent on a particular one. This way they can wander a city safely with no stress over the more basic human necessities, being free to learn and experiment and be individuals at the same time as being part of the community.
In this search for identity and purpose, when a particular thing or place takes a child's interest, then they can enroll in open, community run schools of their own liking, where attendance is not mandatory but voluntary, and they are encouraged by tutors to try various subjects until they find those they are interested in, and then learn by
apprenticeship, with real world goals, people and experiences instead of years of distanced theories in prison-schools.
Ultimately, they can become full and productive members of society, with personal goals and free to associate with people of any age and procedence.
Basically, letting children be independent individuals since very very young, but with the safety net of a large and diverse community instead of a couple adults.
Of course this requires both a slowing down of the insane pace of society and industry, as well as a reduction of the overall population. We really need both of these things now, on a global scale.
Utopian, isn't it
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I know, never in my lifetime...
Edit: ehh. Or not. I don't have any idea on how things should be. Maybe its just that the grass is always greener on the other side, we're condemned to greed, a part of the human condition...