Talk:Incubus/@comment-45424649-20200707193354/@comment-27045866-20200715134415

"Just like monsters, their appearance stops aging at a certain stage. It could be as a boy, as a young man, or as a mature man. Since an incubus is a being that's convenient for a monster, they change depending on the tastes of the monster that they're paired with. In this way, an incubus is none other than an ideal male to a female monster. "

"Of course, in terms of outward appearance, sometimes their partners may be boys of around the same age or even “uncles” so far removed in age that they look like parent and child. In Sorcerous Sabbath, a.k.a. “Shirokuto Sabbath”, which has a tendency for the actual age of witches to be elderly, some witches even have partners who have spent centuries with them and have what could be described as the outward appearance of “grandfathers”."

Nothing ever said that your physical outward age matches your wife's or that you automatically become young. Your lifespan matches your wife or harem's. Monsters generally don't care what you look like. It's about being fit and full of vitality and not necessarily young looking unless it's a fetish thing.