What Is the 7-Year Friendship Rule?

Some friendships fade without anyone noticing. Others survive moves, new jobs, breakups and long stretches of silence. It’s natural to wonder what separates the two, and the seven-year friendship rule is one of the most popular attempts to answer that.

The idea gets shared a lot because it offers a little reassurance and a little perspective at the same time. It also reminds people that friendships change, and that making room for new ones is part of life. Meeting new faces, whether through a hobby, a neighbor or random video chat sites, keeps a social circle fresh and growing while older friendships find their rhythm.

Here’s what the rule says and how to think about it.

The seven-year friendship rule is a popular saying about how friendships last. It suggests that a friendship which makes it past about seven years is likely to last for life. People often pair it with the idea that friend groups naturally shift over time as lives change. It’s folk wisdom, so it works as a loose guide.

Where the idea comes from

The saying is often linked to a 2009 study by sociologist Gerald Mollenhorst at Utrecht University in the Netherlands. He surveyed people about who was in their personal network, then interviewed them again seven years later. Their networks were about the same size, yet only about half of the people in them (48 percent) were still there.

That study shows how much friend groups change over time. It doesn’t show that friendships past the seven-year mark last for life, which is why that part stays a saying.

The appeal of the saying is easy to see. By the time a friendship hits that mark, it has usually been tested. Two people have seen each other through good stretches and hard ones, and they’ve chosen to stay close anyway.

Why do some friendships fade over time?

Friendships often fade because life changes, not because anyone did something wrong. A move, a new job, a relationship or a shift in priorities can quietly reduce the time two people spend together. Without regular contact, even a close bond can drift, and both people may feel unsure how to reconnect.

Life stages pull people in different directions

Friends who once lived down the street can end up in different cities, schedules and seasons of life. Shared routines disappear, and so do the easy chances to catch up.

Interests and values evolve

People grow. Sometimes that growth brings friends closer, and sometimes it gently pulls them apart.

Nobody reaches out first

Plenty of friendships end simply because both people are waiting for the other to call. A quick message saying you were thinking of them is often all it takes to restart things.

Should people worry if a friendship doesn’t reach seven years?

There’s no need to worry if a friendship doesn’t reach that mark. Many meaningful friendships are tied to a certain season of life, and they still matter even if they don’t last forever. A friendship’s value comes from what it gave you, not only from how long it lasted.

It can help to see short friendships as chapters instead of failures. A work friend who made a tough job bearable or a neighbor who made a new city feel like home still left a real mark.

How can someone help a friendship last longer?

Helping a friendship last comes down to steady, simple effort. Staying in touch through life changes, showing up for big moments and making easy plans keeps two people connected. Small, regular gestures often matter more than grand ones, especially when life gets busy and time together becomes harder to find.

A few habits that keep friendships strong:

• Check in during big life changes, not just birthdays.
• Make plans that are easy to keep, like a short call or a walk.
• Be honest when you’ve drifted, and say you’d like to reconnect.
• Celebrate their wins and show up for the hard days.
• Accept that the friendship may look different in each season.

It also helps to keep meeting new people. A wider circle takes pressure off any single friendship and brings fresh energy into your life.

Long Friendships Are Built One Season at a Time

The seven-year friendship rule is a nice reminder that time and shared history make friendships stronger. Still, it isn’t a test that every friendship has to pass.

Some friends will stay for decades. Others will matter deeply for a while and then move on. Valuing both, and putting in a little effort to stay connected, gives every friendship a real chance to last.