Time trends in depression prevalence among Swedish 85-year-olds: repeated cross-sectional population-based studies in 1986, 2008, and 2015.

It is possible that our observed decline in depression prevalence in octogenarians could to some degree be a result of an increasing trend in younger age groups, which would result in fewer depression-prone individuals surviving to age 85.

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Our results regarding depression in 85-year-olds are in line with previously mentioned studies on older adults in general from Europe (Beller et al., 2021 ) and the United States (Sullivan et al., 2020 ; Zivin et al., 2013 ), all of which found a decreasing trend.

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