What Age Should A Person Be Before They Listen To The Genre Of Metal?

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Pick what age would be most appropriate for a person to be before they listen to a song from the metal genre and yes I know some metal isn't innapropriate at all but think of the average metal song and how appropriate it'd be for these ages. Now remember you choose the age where the person would be old enough and (most likely) mature enough to listen to Metal.

Also I just put the never option as a joke but really I guess there are some people that don't think themselves or other people are mature enough for metal.

Hi everyone, you know what I can't believe, well it's how people let kids watch more innapropriate movies that are much more innapropriate than most metal music before letting their kids listen to slightly innapropriate music. So, you may want to know some facts well when I and lots of other kids at my school were around the age of 7-9 most of us were allowed to watch movies with loads of gore and for myself personnaly my parents did'nt allow anything with sexual content, but I was allowed all the gore. But when I turned 13 at that age I was finnally allowed to listen to any metal song I wanted though when I was 10 I was allowed to listen to appropriate metal, not that the metal I listen to know is innapropriate but seriously people limit music to their kids more than movies and in movies you actually see the gore and voilence but that's just my experience and opinion with the whole thing.