16 - 18 doing high school, trying to get the best grades as possible and having fun with friends, still earning pocket money based on chores that they do around the house - nothing comes for free. Should be eyeing out what to study at tech, uni etc.
19 - 21 after taking a year off and doing a basic a job during that year to understand what the real working world is like and coming back down to earth, start studying, maybe take a part time job for spending money, depending on the chosen course. Otherwise parents support with pocket money.
22 - 25 Finishing up course at tertiary. Join working world. Earn money to save up to move out / get married etc.
26 - 30 Get married, by now should be self sufficient and no longer relying on parents.
30+ Living life and restarting process with own kids