How much would the community be different if Riot banned under 18's from playing? (Hypothetical)

I am speaking hypothetically here. Generally speaking, a lot of toxic players in a lot of online games are minors because they have not yet developed the emotional maturity or manners to deal with people in a positive way. So if Riot decided to age restrict League of Legends to 18+. Do you believe that this would help to improve the behaviour of the community as a whole? I don't think they would ever do this but it is none-the-less an interesting arguement to make as older gamers have better control of their emotions and can behave with a certain level of maturity while in game. (Or maybe "manners" are a British thing as I've consistently witnessed on here and we have different expectations here in the UK?)
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