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A Clinical Psychologist would be most likely to treat people with serious emotional problems. The field of clinical psychology focuses on diagnosing and treating those with emotional, mental and behavioral disorders.
The median age of onset for bipolar disorder is 25 years (National Institue of Mental Health), although the illness can start in early childhood or as late as the 40's and 50's. An equal number of men and women develop bipolar illness and it is found in all ages, races, ethnic groups and social classes.