19th June 2025

Tlisted below are many flavors of friendship. Most U.S. adults say they’ve friends who match into particular niches of their lives, like health club associates or work associates. These relationships might come and go as life circumstances change, fading away when somebody switches jobs or loses curiosity in a shared interest.

Then there are shut associates, these you lean on in exhausting occasions and know on a deeper stage. Many U.S. adults say they’ve solely a small handful of associates who match into this class.

Rarer nonetheless are the true ceaselessly greatest associates, those that are by your facet for many years on finish—via jobs, strikes, relationships, fights, losses, and life levels—and will even come to really feel like household. However what makes a friendship sturdy sufficient to face the checks of time on this approach? 

Shared traits, pursuits, and backgrounds assist so much, says Robin Dunbar, an evolutionary psychologist and creator of Mates: Understanding the Energy of Our Most Necessary Relationships. Dunbar’s work suggests there are seven areas of overlap which can be notably essential in forming a stable friendship: talking the identical language, rising up in the identical space, having related profession trajectories, and sharing hobbies, viewpoints, senses of humor, and tastes in music. Each shut buddy pair might not have each considered one of this stuff in widespread—however the extra they share, the stronger their relationship is more likely to be, Dunbar says.

Learn Extra: The way to Make Mates as an Grownup–at Each Life Stage

Regardless of the cliché that opposites entice, analysis really suggests “we desire people who find themselves similar to us,” he says.

Analysis by Jeffrey Corridor, director of the Relationships and Expertise Lab on the College of Kansas, additionally finds that folks must spend plenty of time collectively—not less than 300 hours—to turn into true greatest associates. And, Corridor says, associates who categorical their deepest ideas and feelings to one another are likely to turn into extra tightly bonded than those that hold it floor stage.

When you’re solidly shut with somebody, consistency is vital to staying that approach, says Aminatou Sow, who co-wrote the e book Large Friendship: How We Maintain Every Different Shut along with her buddy Ann Friedman. Journey-or-die associates don’t essentially must see one another on a regular basis, however analysis does recommend friendship upkeep is essential, Sow says.

Assurances in regards to the future—making clear to your buddy that you really want them in your life for the lengthy haul—and creating shared rituals are good methods of doing that, she says. A “ritual” will be so simple as often sending memes or scheduling a month-to-month telephone catchup. Or it may be borrowed from the realms of household and romantic relationships: taking an annual buddy trip, celebrating birthdays and life occasions collectively, even marking your friendship anniversary. “These are small issues that hold the magic alive,” Sow says. 

And it’s certainly “magic,” in Sow’s view. She doesn’t suppose science has all of the solutions relating to shut friendship and why some relationships final ceaselessly. “You don’t predict who you fall in love with,” romantically or platonically, she says. “A few of it’s thriller and magic and the remainder of it’s exhausting work.” 

There’s an ineffable high quality to some greatest friendships, Corridor agrees. Science suggests it takes lots of time to construct a robust bond—“however what’s very bizarre,” he says, is that when folks turn into greatest associates, they could go months and even years with out speaking and nonetheless choose up proper the place they left off. Generally, “as soon as a really sturdy friendship has been created,” Corridor says, “it by no means actually stops being that approach.”

How do real-life BFFs clarify their decades-long connections? TIME spoke to a lifelong buddy pair to search out out.

Amy Kohn, 69, who lives in New York, and Madeleine Rudin, 69, who splits her time between Florida and Connecticut, have been associates for 65 years.

MR: We grew up throughout the road from one another in New York Metropolis. We met on the playground after which began kindergarten collectively the following day. We ended up being in class collectively for 14 years. We simply clicked. 

AK: I by no means felt like I slot in very properly at college, so having a greatest buddy was every part. Madeleine helped me undergo the primary 18 years of my life. It was all the time us in opposition to the world. 

MR: It grew to become trickier once we went off to varsity in several states, however we might write letters. I visited a few times, and we noticed one another once we had been dwelling on college breaks. 

AK: However then we had a protracted interval the place we had no contact. I got here out to Madeleine once I was 21 and she or he was terrific. However I had numerous separate dangerous experiences socializing in straight environments, and because of this, I grew to become enmeshed in New York Metropolis’s homosexual group from my late 20s into my 30s. We weren’t in contact throughout that point.

MR: I made different associates. I wasn’t indignant at her; I simply figured we form of went our separate methods. After which someday out of the blue, Amy emailed me. 

AK: There’s no good reply to why it took so lengthy for me to try this. I lastly did as a result of I had been with my household for Thanksgiving and my cousin requested about Madeleine. The telephone rang instantly after I despatched the e-mail, and it was Madeleine. Again then, I didn’t know e mail went that quick! 

MR: The day we re-met for lunch, I keep in mind weeping. It appeared like such a waste of years, as a result of we simply clicked instantly once more. After that, it by no means stopped. 

AK: In some ways, we’re very totally different—I’m all about sports activities and energetic stuff and Madeleine isn’t into that. However there’s a stage of belief and unconditional acceptance that’s the core of every part. I do know I can inform Madeleine something, and if she disagrees, there’s not a scintilla of judgment. At any time when something actually good or actually dangerous occurs in my life, instantly, I need to inform Madeleine. She simply will get me. If I feel I’m being humorous, she does too. 

MR: I really feel the identical approach. I might have mentioned the identical issues about her! I’ve additionally had lots of well being challenges through the years, and Amy has been there each step of the best way. She’s my go-to, aside from my son. I do know she’s not going to tire of me being unwell. She’s simply so supportive. 

AK: We’re actually specific about how essential we’re to one another. We are saying, “I like you” so much. We’ve got verbalized that we’ll be there for one another ceaselessly and that, at our age, is enormously comforting.

One other piece of recommendation that I gave my daughter is, “Acknowledge that every one of my associates, on any given day, are idiots.” Which means, I don’t love every part they do, however I nonetheless love them.

MR: I’ve informed my son, “You possibly can have associates for various causes.” Not all of my associates need to do every part that I need to do. For some time, I felt like I needed to be as shut with everybody as the following individual. Then I spotted, “No, I don’t.” However with Amy, I don’t have any of these points.

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