Thirteen Looks Like the Safer Age for a First Phone

Parents agonizing over when to hand over a First Phone just got a useful new data point. New research from a children's hospital team found that teens who received their first smartphone at age thirteen showed no increased risk of depression a year later, a sharp contrast with earlier findings that getting one at twelve or younger was linked to worse mental health. The catch: heavy daily use and nighttime access still carried serious risks at any age.

The study followed 1,959 teenagers who had no phone at thirteen. Over the next year, 1,230 of them got a smartphone while 729 stayed phone-free, and the researchers checked back at age fourteen for signs of depression, obesity and short sleep. Simply acquiring the phone at thirteen was not tied to depression at fourteen, according to the hospital's research announcement, though the newly equipped teens were more likely to report insufficient sleep. The paper appeared in a leading pediatrics journal in June 2026.

Thirteen looks like a turning point

The new work builds directly on the same team's earlier study, which tracked 10,588 children in a long-running national brain-development cohort. That research, published in December 2025, found that owning a smartphone by age twelve was tied to roughly a third higher odds of depression, forty percent higher odds of obesity and sixty-two percent higher odds of not getting enough sleep, with the median age of first ownership sitting at eleven. Teens who stayed phone-free at twelve but got one the following year also showed more mental health symptoms at thirteen than peers who still had no device.

Taken together, the two studies suggest the birthday matters. "We can cautiously say that smartphone acquisition at age thirteen appears safer than at or before age twelve," said Barzilay, the study's senior author and a child psychiatrist. He added that the findings point to teens being more emotionally ready for a personal device by thirteen, though he stressed the result is cautious rather than a green light.

What matters more than the birthday

The researchers found that how the phone gets used may outweigh when it arrives. Among teens who had a device by fourteen, those logging more than five hours a day faced more than twice the chance of depression and obesity, and double the chance of not getting enough sleep, compared with peers using theirs for two hours or less. Nighttime access was a second major lever: kids who kept the device outside the bedroom at night were less likely to report insufficient sleep.

"A simple habit appeared to reduce adverse outcomes," Barzilay said, noting that keeping phones out of bedrooms made a measurable difference to teen wellness. The team encourages families to set daily limits and remove devices from bedrooms at night, advice that echoes what recent sleep research has found about the compounding cost of late-night scrolling.

There are real limits to what the study can prove. It did not test which activities drive the harm, so gaming, social feeds and messaging remain lumped together in the data. Both the new paper and its predecessor draw on the same national cohort, so independent replication in other populations is still missing. And the earlier paper disclosed that several authors had ties to the technology industry, a reminder to read industry-adjacent findings with care. Still, for families negotiating the First Phone decision, the research offers a concrete rule of thumb: waiting until thirteen looks safer, capping daily hours looks smarter, and the bedroom charger stays outside the door.

The broader debate is moving in the same direction. Surveys of teen phone habits show that household rules are the single biggest lever families control, with phone-free teens using their devices far less during the overnight hours when screens do the most damage to sleep, as covered in this newsroom's earlier reporting. Researchers are also shifting focus from total screen time to how teens actually scroll, since fragmented attention patterns track more closely with symptoms than raw hours, a shift explored in recent coverage of attention research. For now, the First Phone question has a clearer answer than it did a year ago: later is better, less is better, and out of the bedroom is best.