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At What Age Does Mental Illness Start?

Across all mental disorders, the average age of onset was 14.5 years.

At What Age Does Mental Illness Start? | Psychology Today

Knowing at what age mental illness typically starts is highly important information for psychologists. When it is known when a disorder typically starts, early prevention measures and early interventions can be conducted at the right time. This improves the long-term well-being of the patient compared to a situation where therapy started years after the beginning of a disorder.

At What Age Does Mental Illness Start? | Psychology Today
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In a second step, the scientists also analyzed the age of onset for different forms of mental disorders. In ascending peak age on onset, here is what they found: