If a woman wants to get married, she will marry an old man instead of a young man. It uses exaggerated rhetoric. Old people and monkeys are not real. The reason why she uses these two words is to make the sentence rhyme smoothly, more vivid and easier to remember.
According to research, when men and women are the same age, women's psychological age is much more mature than men's physiological age. If women are more mature than men in a relationship, this relationship will be particularly tired. My sister and I feel the same way about raising a brother. Doing everything for him is like taking care of your brother. It's hard to feel loved. In addition, if you marry an older person, you will be more mature and know how to take care of others. When they marry people younger than themselves, they are often very young and vulnerable to domestic violence. If the age gap is too big, it is easy to be gossiped and disapproved by others.
Of course, these are not absolute. After all, there are no two perfect matches in this world. Marriage is a lifetime thing. If you want to be together for a long time, you need two people to get used to it and remain humble. Another common saying is that "the little girl holds the golden brick". This shows that it is most suitable for women to be three years older than men, but the most important thing is that both are suitable. As for age, it is not a decisive issue.