User blog comment:GoldenFun/My personal theory/@comment-25760276-20180503000054

In the picture depicting a younger version of him alongside Ayano's mom... he doesn't look an absurd amount older than her. Realistically this would make him... maybe in his fifties around the time Yandere Simulator takes place. Which is no age for a grandfather of a 17 year old girl, I'd... think?

You might be right. Just my two cents.