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It's a terrible lie told to men that they can wait until they are 40 to get married and then find a 25 year old. This does not play out in reality. Most young women do not want to marry an "old guy". Most older men cannot handle the immaturity of a young woman. /1
Women usually prefer to marry someone closer to their own age, who is at the same stage of life as they are and who is still interested in doing the things that 20-somethings like to do and who is growing and maturing at the same pace. /2
Older men, while often being more financially stable, are at a completely different stage of life. This creates a fundamental mismatch and can cause a lot of conflict in the relationship. Usually, the man ends up feeling frustrated with the younger woman. /3
They want a 25 year old who acts like a 40 year old. They get annoyed that the young woman is acting her age and wanting to do things that are age appropriate for her. There's a tendency to want to deny her that phase of her life because it's like dealing with a child. /4
This is one of the main reasons large age gap relationships are uncommon and have a high rate of failure. Men who think they can wait until middle age and then snag a younger bride are deluding themselves. /5
The reality is that most people worth marrying pair off pretty quickly. People who are still single by middle age are usually single for a reason. Reasons which may not be deal-breakers for everyone, but are often red flags, nonetheless. /6
An intelligent young woman would be wondering why a man who might seem like a great catch on paper is still single at 40. One assumption is that he made a lot of bad decisions in his youth, like sleeping around with a lot of women, and is maybe not capable of long term intimacy/7
Another assumption might be that he's got some fatal flaw in his social skills that make him impossible to live with or plan a future with. Young women generally don't rank older men highly. Some do, but they are the exception. You should never count on exceptions. /8
Men who think they can wait and settle down later to have a family are in for a lot of heartbreak when they find out that reality doesn't work that way and that they appear really cringey trying to pick up much younger women. There's a very good chance of ending up alone. /9
Of course some people do end up in happy relationships with a large age gap. But as I said, it's uncommon and not something you should stake your entire future on. Men should aim to marry early, just as much as women should. /10
Additionally, although this a somewhat separate topic, male infertility increases with age, as does the chance of genetic defects in a baby conceived with older sperm. A lot of men think they can wait forever, but male infertility is a real thing that happens with age. /11
I would personally never advise a younger woman who wanted children to pair off with an older man, as it increases the chances that she won't get to have as many children as she wants and it's not fair to deprive her of that. /12
For those commenting that this thread has left them feeling depressed... Saying that you can't date women in their 20s when you're in your 40s does NOT mean you can't date at all or that you'll never find anyone. Most people do eventually partner up. You'll be ok. 
