The main age of onset for SAD is 18-30 years; SAD is less likely to occur in older adults. Most individuals who experience SAD are women. White ancestry is not associated with an increased incidence or risk for SAD. However, a family history of SAD or another form of depression is a recognized risk factor.
For more on depression, read here.
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Cite this: Stephen Soreff. Fast Five Quiz: Are You Prepared to Confront Seasonal Affective Disorder? - Medscape - Nov 23, 2016.