The kind of hierarchies we deem necessary are certainly different.
In most of Europe (spoiler: overgeneralization incoming) nobody would have an issue with a child walking alone through a city, going into a bar and ordering a coke. Nobody is going to stop them from taking public transit to a book store, and nothing is legally or physically preventing them from looking at a couple pages in the latest playboy issue in the magazine rack. Though the clerk might interfere out of his own judgement, and depending on the country they might check your age before selling it. You will however be asked for ID before being allowed in a strip club, brothel or casino, or before being sold a DVD of some action movie.
In most of Europe (spoiler: overgeneralization incoming) nobody would have an issue with a child walking alone through a city, going into a bar and ordering a coke. Nobody is going to stop them from taking public transit to a book store, and nothing is legally or physically preventing them from looking at a couple pages in the latest playboy issue in the magazine rack. Though the clerk might interfere out of his own judgement, and depending on the country they might check your age before selling it. You will however be asked for ID before being allowed in a strip club, brothel or casino, or before being sold a DVD of some action movie.