All ages - Appropriate for readers of any age. No swearing or suggestive themes/sexual content. May include mild fantasy action/violence.

Ages 10+ - Intended for readers aged 10 years and older. No swearing. May include mild action/comedic violence, mildly crude humor, or mild tobacco/alcohol use.

Teen (13+) - Intended for readers aged 13 years and older. May include mild swearing, mild suggestive themes, moderate violence, and/or tobacco, alcohol, or other substance use.

Older Teen (15+) - Intended for readers aged 15 years and older. May include moderate swearing, mild suggestive themes/sexual content, partial nudity, violence, and/or tobacco, alcohol, or other substance use.

Older Teen (17+) - Intended for readers aged 17 years and older. May include frequent swearing, intense violence, nudity, sexual content, and/or tobacco, alcohol, or other substance use.

Mature - Intended for readers aged 18 years and older. May include intense language, nudity, sexual content, extreme violence, and/or other mature themes.

These ratings and their descriptors were taken directly from the Seven Seas Entertainment website, but ratings for manga vary publisher to publisher. This is just an example.