The Japanese sense of age generally confuses me. Prez is an "old man" at around 37 but Yajima is a "young man" around 30. I've seen this in more than one manga by now, where dudes in their 30s are portrayed as though they're men in their 50s. It seems like there's an expectation maybe that by the time you're nearing 40, your body is just breaking down?