Another theme might be mentorship. The old man could have a lot of life experience, knowledge, or skills that he imparts to your wife. For instance, if he was a great fisherman, he could teach her how to fish.
One theme could be friendship. Despite the age gap, an old man and a younger woman (your wife) can form a deep and meaningful friendship based on mutual respect and shared interests.
A third theme could be about cultural exchange. Maybe the old man is from a different cultural background. Through their interactions, your wife gets to learn about his culture, traditions, and values, and vice versa. This enriches both of their lives and broadens their perspectives.
One possible theme could be friendship. Despite the age gap between the wife and the old man, they can form a strong bond of friendship based on mutual understanding and respect.
A common theme might be the exploration of taboos. Since having sex with an old man might be considered outside the norm in many cultures, stories could be using this as a way to break boundaries and shock the reader. Another theme could be the search for wisdom or experience. The old man is often seen as having more life experience, and in the context of a sexual relationship in the story, it could be about a younger person seeking something from the older one, like knowledge or a different kind of connection.
One possible theme could be masculinity. Hemingway often explored the concept of what it means to be a man in his works.
One possible theme could be about the generation gap. The young wife and the old man may have different values, lifestyles, and ways of thinking due to their age difference, which could lead to various conflicts and reconciliations in the story.
Another theme might be family harmony. If the wife is obedient, it can lead to less conflict within the family unit and more peaceful co - existence, which could be a major theme explored in these stories.
Power dynamics is also a major theme. Often, the older man may have more financial and social power, which can affect the relationship. The young wife may feel pressured or, in some cases, may try to use this power to her advantage. This can lead to complex relationship webs.
Another theme could be nostalgia. Since it's a story related to an old man during Christmas, it might be filled with memories of past Christmases, bringing a sense of longing for those times. It could also be about the spirit of giving. Fathers often play a role in teaching children about generosity during Christmas, so that could be a theme as well.
Love could be a theme. Maybe it was a story about your first love, the butterflies in your stomach, the shy glances, and the sweet memories.
It's quite unlikely. In most manga, gender identities are usually clear and consistent.
The theme of nostalgia could also be present. The old man in the house may be surrounded by things that remind him of his past. His memories could be a big part of the story, and the theme of nostalgia would play out as he recalls the good old days. Also, there could be a theme of change. His house, which was once full of life perhaps, has now changed, and he has to adapt to the new circumstances. The story could explore how he faces these changes and whether he is able to find new meaning in his life in the house.