I’m a Former Silicon Valley Engineer: Why I Refuse to Give My Kids Smartphones Until They’re 16

13. Physical Health Risks

Spending hours hunched over a screen can take a real toll on kids’ bodies. Prolonged smartphone use is associated with poor posture, eye strain, and repetitive stress injuries like “texting thumb.”
Johns Hopkins Medicine explores how excessive device time can contribute to these physical health concerns, which often go unnoticed until they become chronic.