There's been a whole lot of serious in-depth research on the presentation of bipolar with age. Do episode come more frequently or instead further apart? Can they cease with age?. Do they manifest themselves with more of one extreme than the other? If you're interested you can track down these studies. There's a book by Frederick K Goodwin and Kay Redfield Jamison that goes deeply into the subject, called "Manic Depressive Illness".
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