What Age Do Kids Stop Believing in Santa? What the Studies Actually Say

What age do kids stop believing in Santa?

The short answer: around 8 on average. The most recent study, published online on November 13, 2023 by Candice Mills (University of Texas at Dallas) and Thalia Goldstein (George Mason University), interviewed 48 children aged 6 to 15 who no longer believed in Santa, 44 of their parents, and then 383 adults asked to remember. In both groups the average age at which belief ended was around 8, “with significant variability,” the authors write.

The University of Exeter in England landed on the same number. In December 2018, psychologist Christopher Boyle released interim results from his Santa survey, built on 1,200 responses from around the world, mostly from adults. Average age: 8. The country breakdown is telling: 8.03 in England, 8.58 in Scotland.

Older studies put the mark slightly earlier. In 1994, C. J. Anderson and Norman Prentice at the University of Texas at Austin interviewed 52 children who had stopped believing: most had worked out the truth on their own, at age 7. The one-year gap probably reflects small American samples more than a change of era.

1. 1978Prentice, Manosevitz and Hubbs (American Journal of Orthopsychiatry): belief in Santa, the Easter Bunny and the Tooth Fairy varies with age and with parental encouragement.
2. 1994Anderson and Prentice interview 52 Texas children: the truth is discovered around age 7, often alone.
3. 2015Shtulman and Yoo (Occidental College) link doubt to an understanding of what is physically possible, in 47 children aged 3 to 9.
4. 2018University of Exeter: 1,200 responses, average age of 8.
5. 2023Mills and Goldstein (Developmental Psychology): average age around 8 for both the children and the adults interviewed.

How do kids find out Santa isn’t real?

Two routes dominate, and they often meet. The first runs through other people: a classmate at recess, an older brother, an adult conversation overheard through a door. In the Mills and Goldstein study, most participants named this kind of testimony as part of what tipped them over. The second runs through observation and reasoning: a store sticker left on a box, familiar handwriting on a gift tag, a bit of math about how many houses one man can visit in a night.

The two do not contradict each other. In 1994, most of the children interviewed by Anderson and Prentice said they had figured it out alone. Two decades later, Andrew Shtulman, a psychologist at Occidental College in Los Angeles, concluded that most children probably stop believing through some combination of the two: a doubt that ripens, then one remark that settles it.

The role of physical reasoning

Shtulman and his colleague Rachel Yoo asked 47 children aged 3 to 9 to write Santa a letter with questions, then to explain how he manages his feats. They also asked the children to judge possible and impossible events that had nothing to do with Christmas. The children who best separated the possible from the impossible were also the ones questioning whether Santa’s feats could work, while still offering provisional explanations.

The authors list the three feats that most defy physics as children understand it: visiting all the world’s children in a single night, entering houses through narrow chimneys, flying through the air on a wooden sleigh. When your child asks how Santa fits down the furnace flue, they are not being a spoilsport. They are reasoning.

What are the signs your child is starting to doubt Santa?

Researchers have not drawn up an official list of “signs,” but their methods show what changes. In the letters from the Shtulman study, the most advanced children no longer just asked for a toy: they asked checking questions, about the route, the size of the sack, the way into a house with no chimney.

• Logistics questions: how many reindeer, how many houses, what happens with a tenth-floor apartment.
• Comparisons: why the mall Santa’s beard looks different from the one at school.
• Quiet tests: a letter kept secret to see whether the answer matches, a trick question about the wrapping paper.
• A direct question, often asked one to one: “Tell me the truth.”

One finding surprises many parents: a child who doubts does not always say so. In the Exeter survey, 65 percent of respondents said they kept playing along after they already knew. The survey does not say why. But a child who asks fewer questions in December is not necessarily a child who believes more.

Is it normal for a 10, 12 or 15 year old to still believe in Santa?

The studies do not give a percentage of children who still believe at 10 or 12, and we will not make one up. They do say two useful things. First, the spread is wide: the Mills and Goldstein sample included children up to 15, and the authors stress the range around the average. Second, how long belief lasts depends partly on the home.

As early as 1978, Norman Prentice’s team found that belief in Santa varied with the child’s age and with how much the parents encouraged it, but was unrelated to other measures of the child’s involvement in fantasy. Put plainly, a 10-year-old who still believes is not a child lost in the clouds: they often live in a family that keeps the tradition with real conviction.

A study published in 2025 in Frontiers in Developmental Psychology by Karl Rosengren’s team points the same way. Among 486 American parents surveyed in September 2024, 85 percent encouraged belief in Santa, and the authors note that these parents were more willing to encourage it in older children.

What about 12 or 15?

Past 11 or 12, the question rarely comes up in those terms. A teenager who “believes” is often playing a part they enjoy, as the 65 percent of Exeter respondents who pretended suggest. If you have a genuine doubt, your child is the best source: ask what they think, with no trap, and listen to the answer.

Is believing in Santa good or bad for kids?

The debate is old and has serious advocates. In November 2016, Christopher Boyle (University of Exeter) and Kathy McKay (University of New England, Australia) published a piece titled “A wonderful lie” in The Lancet Psychiatry. Their worry: that children’s trust in their parents could be undermined by this particular lie. The same authors granted that lying to children may sometimes be right, for example to comfort a child after a pet dies.

The data gathered since then soften that worry. In the 2018 Exeter survey, 56 percent of respondents said their trust in adults was not affected, against 30 percent who said it was. A third remembered being upset, 15 percent felt betrayed, 10 percent felt angry. The Mills and Goldstein study found no “drastic loss of trust” in parents, and fewer than a third of participants described negative feelings lasting longer than a couple of weeks.

On benefits, caution is in order. Parents believe in them: in the Rosengren team’s research, 82 percent of the 39 parents interviewed in 2012 saw benefits in encouraging these beliefs, and in 2024 the most cited reasons were “a normal part of childhood” (77.6 percent) and fun (70.8 percent). On behavior, the Exeter survey is split: 34 percent of adults think believing made them better behaved, 47 percent do not.

What research shows most clearly concerns the how, not the whether. In the Mills and Goldstein study, very strong promotion of the myth by parents went with more negative feelings at the moment of discovery. Adults who remembered only negative feelings had learned the truth later, more abruptly, and usually from someone else. We go through the practical side in our guide on how to tell your child the truth.

How do parents feel when the belief ends?

This is one of the most consistent findings, and one of the most touching. In 1994, Anderson and Prentice noted that children described mostly positive reactions to learning the truth, while their parents described themselves as “predominantly sad.” The end of Santa often weighs more on the adult than on the child.

That sadness does not stop the tradition from passing on. In the Exeter survey, 72 percent of parents said they were happy to tell their children about Santa and play along. In the Mills and Goldstein work, between 87 and 95 percent of adults wanted to celebrate Santa with their own children, or already did. The parents interviewed in 2012 by Rosengren’s team had themselves stopped believing at 7.5 on average.

In the United States, the tradition even has an official address. In 1912, Postmaster General Frank Hitchcock renewed the permission, first granted in November 1911, for postal employees and citizens to answer letters to Santa, and USPS dates what became Operation Santa from that year. Nothing stops a child who has figured it out from writing anyway: our letter to Santa page welcomes letters from older kids too.