Fig. 2. Overlap of symptoms across the major mental disorders with relation to the type of the symptoms and the age onset of disorders.

Dominant symptoms respective to age-related mental disorders are represented by respective labeled bars. The typical age-of-onset for each symptom is characterized by the linear start position of each bar, and symptoms have been separated according to classification whereby excessive (surfeit) symptoms are positioned above the horizontal axis and deficits are positioned below the horizontal axis. ADHD Attention deficiency and hyperactivity disorder, ASD autism spectrum disorder, TS Tourette syndrome, BD Bipolar disorder, SCZ schizophrenia spectrum disorder, MDD major depressive disorder, AXD anxiety disorders, AD Alzheimer’s disease.