My first wife is 13 years younger than me, and frequently interacting with women significantly younger than her who might make a great second wife. It's a hot topic but I don't believe it should be taboo. Recently I took out a young woman on a picnic date and to a place afterwards, with my wife and kids along too. It was fun.
If we could correct the culture I would start by raising young men with a discouragement towards interacting with women. When I was in my twenties I worked 70 hours a week almost the whole time. Expecting young men to work hard (50-60 hours is nothing for them, I still do it) and to save money and learn how to invest should be the focus.
When you are a young man in junior high, all the girls want to date high schoolers. When you are a young man in high school, all the girls want to date college kids. This is normal biology. A grown man with a solid life doesn't generally care if the girl works in a coffee shop as long as she has potential. A man who has been through hardship and been torched earlier on in life but found the light and built a strong foundation can improve the lives of other people too, if they are open to it.
When I was younger, my uncle once told me that he had his eyes on a high school girl down the road. It sounded tawdry. Then he explained that in his point-of-view it made more sense, because he owned land, had a career, and any woman he took as his own would just become a beneficiary of his lifestyle. If she were to give herself to younger (less serious) men, then she will be in for potentially decades of emotional and financial hardship.
When you start to realize this then you start to consider that older men talking to younger women should be socially acceptable. But the fathers are important. We live in a fallen world which consistently demeans and mocks strong fathers. A strong father with a good moral compass can identify other men with similar values, and make good choices for his daughter, provided she appreciates and approves his pick.
The Bible describes how a young man is expected to make marriage arrangements, then withdraw for a period of time and build her a marriage house. It's not two young kids trying to go out on their own and just start out from scratch, that's crazy-making. The Biblical model is an older man who has built substance, who is under the purview of his father who has significant substance, going out and finding a young woman (or two or three) and using his substance to build her a home so she can begin to build a family with him. And that man who is marrying has to pay the father some of his financial substance, which makes the daughter a good investment for the father who is giving her away to her new husband. And that father then is recompensed for many of the years he self-sacrificed to support her mother and the girl, making a later life easier on both the mother and father. So, the entire cycle is beneficial and strong for everyone! Families using this system just get bigger and stronger as the generations progress!
Besides, women are hot for stable older men, and stable older men are hot for younger, less experienced women who want to join-in to his life goals and direction. The more I realize how we are designed, the more cynical side-eye I give to same-age couples.