Responses
We don't know that yet since Erina died. But it could be possible if alpheas "did it" with another women after she died, which i think is less likely he would ever did. And remember that blue haired guy is also the grandpa of mc's friend, so i'm pretty sure alpheas IS that old
did we just forget how mc literally as a child met this grandmaster who's old af in the first few chapters? The timeline between them is just not match at all
I think mc is their son? The color of the hair and eyes are both taken to them and the power, genius and innocent of mc is also taken to them too.... And headmaster might not that old but because he lost his wife he withered like that just like the other stories when they lost someone special to them they're become older for some reason. That's my thoughts