He's got life experience, they'll say, or he can offer me more security. They're looking for commitment, and they think they'll get it with someone with a few more years under their belt.
However, if you've been lucky enough to snag yourself a younger guy, you'll know that you can get all those things and more from a man who's younger in age.
You don't have to take our word for it: just ask Kylie Minogue, whose fiancé Joshua Sasse is 20 years younger than her, or Sam Taylor-Johnson, who's married with two children to Aaron Johnson, 35 years her junior!
Those who've already found out the secret to happiness know that a younger man can make you feel like a whole new woman.
Here are 9 reasons why we'll never be without ours...
1. They're in no rush
An older guy might want to be settled down already, whereas younger men have got all the time in the world. Whether it's buying a house, building a career or having kids, you don't have that same sense that the clock is ticking with your younger man - you're just happy to enjoy each other's company.
2. But they also dream big
The world may not have crushed your younger guy's spirit yet, meaning he can't wait to conquer all of the goals he's set out for himself. He's smart, ambitious and raring to go, and you'll probably find these qualities have rubbed off on you too.
3. They respect your opinion
It's not true of every older guy, but often, men who've got some years on you want to take charge of big decisions. Younger partners subvert that age = wisdom trope; they'll share their opinion, sure, but they're also far more likely to listen to yours.
4. They're full of energy
If you love an active lifestyle, your younger man can always keep up. Exercise, playing with the kids - you name it, his energy levels know no limits, and you've probably found that they're pretty infectious too. Not to mention...
5. They have a higher sex drive
We'll spare your blushes on the details, but from the age of 30, men's sex drives typically begin to decline. So the younger your man, the higher your chances of having a great, active sex life (but you probably knew that already).
6. They defy your critics
Women who are noticeably older than their partner might find themselves getting a stare or two from especially judgemental people. If he sticks around through the glances and the bitchy comments, you know he's a keeper, and doesn't care what other people think.
7. They've got less baggage
Everyone has a past, and some people's pasts are far more complicated than others. Of course, you can love someone with the messiest history in the world and it can work, but your younger man will probably have had fewer relationships, making him less jaded, and more trusting of you.
8. They can teach you a thing or two
From talking you through the world of social media to recommending the new, places to go for dinner or a night out, your younger guy knows exactly how to help. Snapchat, here you come...
9. They make you happy
If there's one thing a younger guy knows how to do, it's how to have fun. Your younger guy can make you laugh til you cry and then some, and he'll take you on some of the best adventures of your life!
Do you have a younger man in your life? Did we miss any reasons why they make the best partners? Let us know in the comments below!