What Age Should My Kid Get a Phone? The Study Says Later Than You Think
Every other kid in the group chat has one. That’s usually the sentence that starts this whole conversation, not a milestone birthday or a school requirement. Your child brings it up at dinner, you say you’ll think about it, and then you spend the next three nights googling the same question at 11pm.
Most of that googling lands on screen time charts. Minutes per day, apps to block, bedtime cutoffs. Almost none of it mentions the one number a 2025 study out of Children’s Hospital of Philadelphia says matters more than any of that: the age on the box when the phone becomes theirs.
Why age turned out to matter more than the minutes
For years the advice was mostly about limits: hours per day, phones off the table, screens dark before bed. Those rules still matter. They’re just not the whole story anymore.
The Children’s Hospital of Philadelphia team, working with UC Berkeley and Columbia, followed adolescents through the Adolescent Brain Cognitive Development Study, the largest long-term study of kid brain health in the country. What they found wasn’t really about how many hours a 12-year-old spent on a screen. It was about how many years that screen had already been theirs, unsupervised, in their bedroom, their backpack, their bed.
What “before 13” is actually doing to a kid
Sleep took the biggest hit in the data, and it isn’t hard to guess why once you picture a phone tucked under a twelve-year-old’s pillow at midnight. A younger brain doesn’t have the executive function yet to put the phone down on its own, and most kids that age never get the chance to try, because a phone that young usually wasn’t meant to leave the kitchen counter in the first place. Our guide to the sleep tools actually worth the nightstand space covers what to reach for instead.
The obesity link runs through the same door: less sleep, less outside play, more scrolling on the couch instead of moving. The outdoor habits that used to fill that gap are usually the first casualty, one notification at a time. None of this needs a villain, it’s just what an unstructured afternoon looks like once a phone moves in.
And the depression risk, the one parents worry about most, is tangled up with both of the others. Bad sleep alone raises a kid’s risk of low mood. Stack a social app’s comparison trap on top of a brain that’s four years further from ready, and it starts to make sense why bedtime itself can change shape once a phone moves in.
So what age is actually the right one
There isn’t a birthday where a switch flips and a kid is suddenly ready. The CHOP researchers followed their own study with a caution worth sitting with: age limits alone won’t fix this, because a 13-year-old handed an unsupervised, unlimited phone is walking into much the same risk a 10-year-old would.
What the data does support is this. Later beats earlier, on average, and 13 holds up as a far more defensible line than 9 or 10. If your child is asking now and they’re eight, the study gives you real cover to say not yet, and mean it.
The signs that actually mean readiness, not just age
A number on a calendar is easier to google than a description of an actual kid, so here’s the second version. Readiness looks less like turning 13 and more like a child who can put a device down without a fight, who tells you when something online upset them instead of hiding it, and who already manages the routines they have without you standing over them.
None of that is about being a perfect kid. It’s about whether the executive function is there yet to handle a device that never really turns off. Kids who still lean hard on visual routines and reminders, or whose mornings run on a chart on the fridge more than memory, sometimes do better with a little longer on a basic phone first. That isn’t a punishment. It’s matching the tool to where the brain actually is.
Thirteen isn’t a magic number
None of this makes the phone conversation easy just because you’ve read a study. It just means you get to walk into it with a number that isn’t made up, and a reason your kid can’t fully argue with. Thirteen isn’t a promise that everything will be fine. It’s just the age where the odds finally start tilting back in your favor.
Frequently asked questions
A 2025 Children’s Hospital of Philadelphia study found the risks of poor sleep, obesity, and depression climbed the earlier a child owned a smartphone, starting as young as age four. Thirteen held up as a meaningfully safer line than 10 or 11, though researchers stress it isn’t a magic cutoff on its own.
Generally yes. A basic phone covers the calling-and-texting reason most parents give for wanting their kid reachable, without the constant internet and social app access the CHOP study links to higher risk. Many families use one as a stepping stone before a full smartphone.
Look for a kid who can put a device down without a meltdown, tells you when something online bothered them, and already manages basic routines like getting ready for school on their own. Age matters less than whether the self-control to handle an always-on device is there yet.
Both matter, but the CHOP researchers found age of ownership carried its own separate risk, on top of how many hours a child spent on the phone once they had it. Waiting longer and setting real limits once you do both help.
No. The same study found the risks tied to how the phone gets used, not just when it arrived. Adding real limits, keeping it out of the bedroom overnight, and staying involved all still make a measurable difference from here.
I'm for the parent doing it largely alone. I've done the single-dad decade - two homes, one income, the handovers, the very quiet Tuesdays - and I write from the far side of most of those days, with humour and hard-won calm. Not advice from above; a hand back from a few steps up the road.
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