Gen Z has officially become Generation Scroll. According to recent screen time data, the average Gen Z user now spends roughly nine hours a day on screens, outpacing millennials, Gen X and boomers by a wide margin. Another report found that nearly one in four Americans ages 18 to 29 say they spend nine to 12 hours a day looking at screens.
Nine hours is not a habit. It’s a second life.
For years, the conversation around screen time has mostly focused on mental health, and for good reason. Research has consistently linked heavy screen use with higher levels of anxiety, depression, loneliness and poorer sleep. A 2025 CDC analysis found that teens with limited physical activity and sleep are at higher risk for depression, anxiety and poorer quality of life, while screen use itself has also been tied to worse mental health outcomes.
But the screen time problem is starting to look bigger than a mental health issue. It’s physical. It’s social. It’s cognitive. And if the current trajectory continues, Gen Z may not just feel more anxious than previous generations. They may become less healthy, less focused and less capable of doing the slow, frustrating work that real life keeps rudely requiring.
A recent wave of concern around Gen Z’s cognitive performance has only sharpened the conversation. Neuroscientist Dr. Jared Cooney Horvath recently argued that Gen Z is the first modern generation to perform worse academically than the one before it, pointing to declines across attention, memory, literacy, numeracy and executive function. The argument is part of a larger debate over whether the long-running “Flynn Effect” — the steady rise in IQ scores across generations — may be stalling or reversing in some developed countries.
Dr. Hannah Nearney, a psychiatrist with Flow Neuroscience, said the findings are worth taking seriously, but not simplistically.
“I thought it was really interesting because it was looking at generational changes over time and the trend being really different from what has been an upward trend in IQ for many generations,” Nearney said. “As time in education increases, people leave school at a later age and are in formal education for more years. It’s quite surprising that this type of change is being observed.”
Nearney said the bigger question is not whether screens have magically made an entire generation less intelligent. The more useful question is what screens are replacing.
“The correlation between increased screen time and this going on doesn’t necessarily tell the full story or give the nitty gritty of what the causation is,” Nearney said. “It’s more giving a bit of a red flag. One aspect might be what screen time is actually replacing, rather than it being the screen time itself. If you’re spending a lot of time on a screen and you’re not doing other things that are good for cognitive balance and development — like reading, socializing in person, playing physically with other children, having physical exercise, eating meals with families together rather than eating while you’re on the screen — screen time replaces so many other potential varied experiences that contribute to somebody’s cognitive development.”
In other words, the phone may not be the only villain. The empty space it creates might be doing damage too.
Less time outside means less movement. Less movement means worse sleep, weaker physical health and fewer of the embodied experiences that help regulate stress. One recent survey found Gen Z spends less time outdoors than Gen X, averaging just 49 minutes a day outside, and 67% said they can go days without stepping outside at all.
The sleep piece is especially brutal. Excessive screen use, particularly smartphone use, has been increasingly associated with poor sleep quality and daytime sleepiness. And once sleep starts collapsing, everything else gets messier: mood, focus, appetite, motivation, spiritual rhythms, relationships, all of it.
Nearney said the cognitive concern is partly about friction — or, more accurately, the disappearance of it.
“When you’re using digital aids in the classroom or for self-study, it reduces friction,” Nearney said. “It reduces the level of work or deep focus that might be required to get to the same goal. Voice-to-text means you’re not needing to write or even type anymore. Asking Alexa to do a sum for you rather than putting it in a calculator yourself is easy, but it’s too easy in a way because our brain is not having to work or even develop the skill in the first place.”
Convenience is great until it becomes a substitute for formation. A map app is helpful when someone already knows the basics of direction. AI is useful when someone already knows how to think through an argument. A search engine is magic when someone already has the patience to read the answer.
But when the shortcut arrives before the skill, the brain may never build the muscle.
“What if your brain never learns those skills in the first place?” Nearney said. “That’s a very different educational experience. Is there something about the lack of in-depth focus or having to learn through frustration, repetition and getting something wrong? Are we taking away some of that experience that’s actually really important?”
Still, this doesn’t have to become another doom spiral about Gen Z being cooked. The story here is alarming, but it’s not hopeless. Brains are not cement. Habits are not destiny. Neuroplasticity is real, and young brains are especially responsive to change.
“We don’t want to get caught up with these big observational, generational trends, because that’s really different from any individual,” Nearney said. “The good news story is that we know brains are able to change and develop new pathways. That plasticity is there, especially in this age group. These young adults and adolescents are still super responsive. They’re easily able to develop their skills and get their skills more balanced.”
The fix, thankfully, doesn’t require everyone to throw their phone into a lake and start churning butter. Nearney said the better approach is to put back what screens have pushed out: reading, writing, physical movement and face-to-face conversation.
“Going back to what screen time might be replacing, it’s about adding some of those things back in,” Nearney said. “Executive function skills are the skills the front part of the brain controls. It’s the control center. It’s decision making, regulating emotions, organizing your thinking, planning ahead, being flexible and regulating focus. A varied experience of life and education — not just in the classroom — helps those skills develop.”
That means reading something longer than a caption. Writing something by hand. Taking a walk without turning it into content. Eating with people without a phone face-up on the table like a tiny glowing third wheel.
Nearney said even small shifts matter.
“Screens are convenient, but physically writing helps you process something differently,” she said. “There are different skills involved in how you think and write at the same time. Physical exercise is super important for mental health, physical health and cognition. Balance is the important side — not just going straight to the easy fix when you don’t know something or have a slight struggle.”
Interestingly, Gen Z may already know this. A 2026 survey found Gen Z and millennials are more likely than older generations to deliberately cut back on screen time, with 63% of Gen Z saying they have made an effort to disconnect for their well-being. Many reported feeling more productive and present when they unplugged.
Nearney said the goal shouldn’t be panic or moral superiority. Screens are part of modern life. Some digital connection is real connection. Some screen time is productive, creative and genuinely good. The issue is whether digital life is replacing the very things that make people resilient.
“It doesn’t mean they’re all going to end up hopeless, because they’re not,” Nearney said. “This generation is much more savvy at certain things, and because of the level of screen exposure they’ve had, it’s not all bad. But it is about balance. When people are isolated, when screen time is replacing other activities that are very good for mental health and resilience, that’s what we don’t want to happen.”