You should reread it to find out I mean why not? I'm pretty sure it's around in vol.1. As I remember Doumeki said his age but Yashiro didn't. But Kageyama sensei said his age and the same age as Yashiro, I think.
If I'm not wrong yashiro is 29 same as kageyama, I just finish the whole chap yesterday but I already forget it β₯οΉβ₯ I will juat reread it then γΎ(ββΉβ‘βΉ)οΎ~
I love this very much