It's true, but manga in Japan is not limited to 12-13 years old but very segmented throughout age groups. For example, anything labeled with "Seinen" (usually t

It's true, but manga in Japan is not limited to 12-13 years old but very segmented throughout age groups. For example, anything labeled with "Seinen" (usually those published under magazine with title prefixed with "Young", e.g. Young Jump, Young King) is intended for the 18~30 age range. Even "Shonen" (male 13~18) nowadays are not very strictly shonen. "Shoujo" (female 13~18) most of time shouldn't really labeled shoujo. The problem is that Kodansha never publicize the title of 30% that has been rejected, so we're in no way to know whose standards are at issue here.