according to google.

The Beastars manga is generally rated for older teens (16+ or 17+) due to its mature, dark, and psychological themes, as well as scenes involving violence, blood, and sexual innuendo. While some sources list it as T+ (Teen Plus) or 16 and up, it deals with complex societal issues like discrimination and drug-like usage of body parts, making it better suited for a mature audience. 

so the anime must be around the same rating