Self sufficiency in today's youth and young adults

[MrG]

In the past people moved out, got married and lived fully fledged lives full of their own unique challenges just after high school and army training (for men).

Today the image seems to have changed slightly.

What in your mind is acceptable/targets for people aged in the ranges:
16 - 18
19 - 21
22 - 25
26 - 30
30+

Where should what responsibilities come into play. When should kids stop getting allowances, start earning their own money for parties, vehicles, petrol, medical aid, move out and such. When does (should) the parental assistance factor no longer play a role.

Keen to hear what is considered a defacto standard (or acceptable) and what is simply plain lazy.