Kids Who Open Social Media Accounts at 11 Are Six Months Behind by Age 16

A longitudinal study published in August 2026 in Nature Human Behaviour provides some of the strongest evidence yet that early social media use damages academic performance—and the damage compounds year after year. Researchers led by Marco Gui at the University of Milano-Bicocca tracked 5,227 students across 28 schools in northern Italy, linking the age at which children opened their first personal social media account to their later scores on standardized INVALSI tests in Italian, mathematics, and English .

The earlier they start, the worse the results

Students who opened their first social media account in Grade 6 (ages 11–12) scored significantly lower than those who waited until Grade 9 (ages 14–15) or later . By Grade 8, early adopters scored about 0.22 standard deviations lower in Italian and 0.18 standard deviations lower in mathematics . The researchers note that 0.2 standard deviations is roughly equivalent to six months of school learning .

The gap did not close over time. By Grade 10 (ages 15–16), the deficit in Italian remained at 0.22 standard deviations, while the math deficit widened to 0.27 standard deviations . Students who started in Grade 7 or Grade 8 also showed smaller but still significant deficits compared to late joiners .

The researchers describe the effect as compounding over time: the earlier the start, the larger the accumulated deficit by later school years, likely driven by persistent distraction, time displacement, and disrupted learning habits . A separate analysis from the European Commission's Joint Research Centre similarly links unregulated recreational digital use—especially passive social media engagement and media multitasking—to lower academic performance through distraction and time substitution pathways .

The surprise: English was unaffected

An unexpected finding emerged: the negative effect on English test scores was not statistically significant . Researchers speculate that because English is a foreign language in Italy, it is primarily learned in formal classroom settings with less exposure to distracting social media content in that language. Alternatively, students may engage with English-language content on social media in a way that partially offsets lost study time .

A global wave of age-based restrictions

The study was published against a backdrop of rapidly tightening restrictions on children's social media access worldwide:

• Australia became the first country to ban social media for children under 16 in December 2025 via the Online Safety Amendment (Social Media Minimum Age) Act, covering TikTok, Instagram, Facebook, YouTube, X, Snapchat, and others . Companies face penalties of up to A$49.5 million for non-compliance .
• France passed a law in July 2026 banning under-15s from opening social media accounts, effective September 1, 2026 .
• United Kingdom announced in June 2026 a landmark plan to ban social media for under-16s, backed by 9 in 10 parents, with legislation expected before Parliament by Christmas 2026 and enforcement by Spring 2027 .
• United Arab Emirates introduced a minimum age of 15 for social media users in June 2026—the first Arab country to do so—with teens aged 15–16 allowed to use platforms only under parental supervision with content filtering .
• United States has no federal ban on children's social media access, though several states (e.g., Utah, Arkansas, Texas) have passed or proposed age-restriction laws. The federal landscape remains fragmented and without a uniform under-16 ban as of August 2026 .

What the study does—and doesn't—prove

The study's authors note that their findings provide "compelling evidence that early engagement with social media adversely affects learning outcomes" and support the rationale behind age-based restrictions . However, they caution that the observational design—comparing early adopters with late adopters using difference-in-differences models—cannot prove causation . Other factors, such as pre-existing differences in self-regulation or family environment, could contribute to the results .

What the data does show is a clear, dose-response pattern: earlier adoption correlates with larger deficits, and those deficits compound over years of schooling. For parents and policymakers debating when to allow a child's first social media account, the study offers a straightforward data point: waiting until at least age 14–15 appears to carry significant academic benefits.