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At What Age Should Children Get Smartphones? — Reading the Twenge/Haidt Debate to Design Your Own Approach

By Leon MoriguchiPublished May 15, 2026Updated May 18, 20267 min read日本語版あり
Audience
Parents of children in early-to-middle primary school; parents currently deciding whether to provide a device, or already feeling uncertain about one already given

TL;DR

  • ·A correlation between screen time and adolescent mental health exists, but effect sizes vary substantially across studies and causal relationships have not been established — one specification curve analysis found that technology use explained at most 0.4% of the variation in wellbeing, less than the association with wearing glasses
  • ·The 13-year minimum age set by social media platforms was created by a US data privacy regulation, not a developmental readiness judgment — age verification is self-reported and technically unenforceable
  • ·"Not designing anything" is itself a choice that leaves device use to platform defaults and algorithmic design; a staged transition with explicit rules, built with the child's participation, produces more autonomous compliance than imposed limits

Contents

  1. Lead
  2. Current Landscape
  3. Who Has a Device
  4. Reading the Twenge/Haidt Debate Fairly
  5. Correlation Exists; Causation Is Contested
  6. Gaming Disorder: Time Alone Is Not the Diagnosis
  7. Designing a Household Approach
  8. A Staged Device Transition
  9. Write the Rules Down and Review Them
  10. Summary
  11. References

Lead

"At what age is it okay to give a child a smartphone?" As of 2025, science has not produced a definitive answer to that question.

Researchers are still in active dispute. On one side is the claim that screen time has serious negative effects on adolescent mental health; on the other, that the effect sizes are statistically small and causal relationships have not been established. National policies span a wide range — Australia's law banning social media for under-16s, the EU's Digital Services Act, the UK's Online Safety Act — but the interpretations of the underlying evidence that inform those regulations differ substantially.

This article is about reading that debate in a way that is useful to a family making a decision. The goal is not to wait for science to settle the question but to understand the current state of the evidence — its quality and its limits — well enough to build a household approach on it.

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