in that case, the sky is falling, chicken little said
ADHD is generally diagnosed in children by the time they’re teenagers, with the average age of diagnosis being 7 years old.
From the study:
Conclusions and Relevance Among adolescents followed up over 2 years, there was a statistically significant but modest association between higher frequency of digital media use and subsequent symptoms of ADHD. Further research is needed to determine whether this association is causal.