I heard in Japan that the age group for them to watch Boruto is around the age for kids to watch the show with there grandparents. So I think that's like the age of 6 or 7 and this was confirmed by Masashi Kishimoto as well when the show was in production.

But for adults I can see that this anime isn't for a little kid to look at especially when Boruto and other characters swears with curse words.

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