title: Age at first onset for nonbipolar depression.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D003866:Depressive Disorder / Q000175:diagnosis* / Q000523:psychology; D006801:Humans; D008875:Middle Aged; D011581:Psychological Tests