Like young people in America aged 16-21 who cannot buy alcohol legally in the US? That seems pretty totalitarian and paternalistic from outside the US
Perhaps it would be free-er for the government to intervene and force everyone to have a different cultural expectation, but both are very substantial interferences.
Going to go ahead and recommend against those words in that order.
Most places restrict the age at which you can buy alcohol and most places seem to restrict it to at least 18. 21 is higher than the average but legal age laws seem to be pretty standard.