3/4 of persons diagnosed with schizophrenia are between the ages of 16 and 25. Drug usage can be a marker or exacerbate the symptoms and I am pretty sure that social media and violent video games don't help in this regard either.
Schizophrenia.com, paranoid schizophrenia - Schizophrenia info; overview of the disease
Worldwide the number of cases are estimated to be 1%...once again the USA exceeds the norm with 1.2%. That's 3.2 million Americans with the disease. It's probably safe to wonder why we don't have more incidents like these.