> Young people have always had the power to support themselves without anybody's help.

You do not know much about history, do you?

> Young people have always moved away from their families for marriage, or for becoming sailors, soldiers, miners, hunters, lumber jacks, etc.

Eh, for a bulk of history, people stayed in village where they were born. Women moved to husbands house, rarely other way round, but that is basically it. Miners and hungers and lumber jacks did not moved away from village.

And soldiers and sailors were tiny minority.