• 50% of Americans will meet the criteria for a diagnosable mental health condition sometime in their life, and half of those people will develop conditions by the age of 14.
• Symptoms of major depression usually begin in the mid twenties.
• The average age at onset for a first manic episode is the early twenties.
• Symptoms of schizophrenia usually begin to in the late teens or early twenties.
• Suicide is one of the leading causes of death in adolescents and adults, ages 15 to 24.
• On average, American adults wait 10 years from the onset of symptoms of mental illness to seek treatment

Source: National Institute of Mental Health