The age of diagnosis varies:
Age at Diagnosis of Bipolar Disorder
http://bipolar.about.com/b/2009/09/0...r-disorder.htm
Quote:
They found the median age of onset – the age found in the middle of the set of all ages – was 25.2 years old.
Those with bipolar I disorder tended to be diagnosed earlier than those with bipolar II disorder and men were diagnosed younger than women.
25% of those in the study were diagnosed on or before age 20; only 2.81% were diagnosed at age 13 or younger.
What I found particularly interesting was the incredible range for the age of diagnosis.
There were children as young as 10, but also seniors in their 80's.
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